Small Block & Big Block Chevy Specific - 468 Big Block at 8000RPM

what would be the best combination to build a 468 to spin 8000rpm?

Why 8000rpm?

deep pockets if you'd like to do it more than once..

probally ditch that boat anchor for a LS would be best

probally ditch that boat anchor for a LS would be best

You're an idiot.

Seriously? Get your LSx shit out of this subforum because no one cares for that opinion here. Calling a BBC a boat anchor is funny, because a mild BBC will shit on an LS1 when it comes to power.

To OP: Your gonna need to do a lot of research for that.
Lightweight/Ti valves,
Ti retainers,
Lightweight but stupid strong springs.

It's not just the 8000 RPM you have to worry about, its the combined weight of all those pieces at 8000 RPM. The heavier, the harder to control.

light weight billet crank good rods either a promod style steel i beam or if it is just a race car aluminum and good forged dome pistons and a really good balance job and good clearances then good heads and alot of lift and duration

If you plan on doing this regularly then a good valve train is difinetely the most crucial thing. As far as the bottom end is concerned though, a 468 will live at 8000 rpm all day. A four inch stroke is far from excessive in a big block. My 454 has seen 8000 a few times with a stock LS6 bottom end with just a windage tray in it. I'm also running a solid roller and all it has for valve train upgrades is crane gold roller rockers and a good set of valve springs and I haven't had a problem yet.

Seriously? Get your LSx shit out of this subforum because no one cares for that opinion here. Calling a BBC a boat anchor is funny, because a mild BBC will shit on an LS1 when it comes to power
This is ls1tech right??? and I don't think so....I think you have that backwards. BBC=heavy turd

This is ls1tech right??? and I don't think so....I think you have that backwards. BBC=heavy turd

Heavy is relative, that's more of a matter opinion but turd? ...not so much

This is ls1tech right??? and I don't think so....I think you have that backwards. BBC=heavy turd

:bang::gtfo:

This is the SBC/BBC section of LS1 tech, don't like it? Get the fuck out.

Weight doesn't mean anything when it comes to an engine making horsepower, only in getting it down the track for a faster ET.

I didn't mention ET, I said Horse Power.

A mild 468/489/496 BBC with aluminum heads weighs as much as an iron SBC, and usually make 600-700 to the tire on 91 pump gas.

I'm not even going to talk about a mild-wild BBC, or a race gas only BBC.

I always thought et mattered more than hp

The extra power potential due to the shear size of every part of the motor more than makes up for the extra 75lbs. compared to an iron LS motor. Even if you want to make the arguement that the weight difference compared to an aluminum block is over 100lbs, the difference in power potential is even more.

You would be looking at almost 300# over a aluminum ls.

An aluminum head/intake big block weighs about 550# and an aluminum LS weighs about 450 (give or take a little on both), so where's the 300# difference?

A aluminum ls comes in at about 365# with oe parts, engine only...fyi....I think your a bit optomistic on your BBC weight. So 200#

you could get an all aluminium bbc

They were very rare. A iron bbc is 685#. Aluminum heads + intake drops that by 90#....according to my research

I've seen from 385-430, I guess it depends what's on it for accessories but that would put the iron block at at least 450 I guess it depends on what accessories are on it. Personally I'll take the weight but whatever, I'm not trying to knock the LS motors at all they both have have their advantages. I'll agree to disagree because we've gotten a little off topic, the original question asked was about reving a 468 to 8k.

You tune for MPH not ET first off as it is a direct representation of power. Second, a BBC is what powers NA 100 octane Manual transmission pro stock cars to 6s in the 1/4. My 68 Camaro had no concern for the "Heavy" 468 under the hood as it still came in at 2950lbs with me in it. By the way, I haven't seen an LSX in Top Fuel lately. The LSX is a great platform, no denying it. But when you just need to have brutal, shake the earth, horsepower and torque, the Big Block will always be King.

OP, why is it that you would like to spin a Rat motor to 8k? I'm not asking as if it can't be done, I'm just interested in why do you need to?

Oh yea....I forgot that we all have pro stocks and top feuls in our driveway :eyes:. When a bbc can run 11.1 @124.6 and get 20-22 mpg city 27-29+ hway mpg (keep in mind this is a stock '02 ls6 in a real street car, my DD) makeing it affordable to drive let me know when a bbc can do that. I used to like bbc back in the day, but now in these days there is much better alternitives. I had friend back in HS build a L88 to spec with the exception if a little clean up on the heads....man I thought that thing was badass. It would turn 7800 and ran 10.6 - 10.8 in a 71 semi race/ street camaro on race gas. There's your answer OP....build you a L88.

i was curious of some ideas it has be all cast iron for the rules in the class im in and i had a 409 and im allowed 468 so upgrading to more cubes. its for truck pulling and thats the power band that works the best so it doesnt fall on its face. ya its not a ls motor but it doesnt hurt to get input from other motor builders.

the compression is about 13:1 that i want it at

Oh yea....I forgot that we all have pro stocks and top feuls in our driveway :eyes:. When a bbc can run 11.1 @124.6 and get 20-22 mpg city 27-29+ hway mpg (keep in mind this is a stock '02 ls6 in a real street car, my DD) makeing it affordable to drive let me know when a bbc can do that. I used to like bbc back in the day, but now in these days there is much better alternitives. I had friend back in HS build a L88 to spec with the exception if a little clean up on the heads....man I thought that thing was badass. It would turn 7800 and ran 10.6 - 10.8 in a 71 semi race/ street camaro on race gas. There's your answer OP....build you a L88.

Cool story bro.
Since when does mpg matter in a dragcar/truckpuller/warrior car?

OP What heads? Intake?

What do you have for a budget?

I have been a part of a few 8800 rpm BBC's that made over 1,000 horspower with ease on the engine dyno.

Overall, it is going to cost a bit to keep the valvetrain alive.

In a car that I'm building for shear power, I could care less about MPGs. Let me know when you can get 1600+ NA horsepower from an LSX. If you really want affordable, the 463 BBC in the 79 Malibu parked in my dad's driveway was a grand total of $7000 (car and entire power train). It turns bottom 10s NA, and that was him trying to sandbag it because he didn't want to break the 9.99 barrier. That's with iron heads btw...

OP, the valvetrain will make or break this setup as well as the balancing with a good set of rods to hang on to it all. Your also going to need some large ports to keep it breathing up top.

Cool story bro.
Since when does mpg matter in a dragcar/truckpuller/warrior car?

OP What heads? Intake?

When gas cost $4+ a gallon and when your car/truck is'nt a garage queen. Ya'll sound like my dad....bigblock this bigblock that....then he drives a geo metro around to save gas. If ya believe in that shit don't be scared to pay the price to drive it. Op there is a guy around here that builds bbc pullin motors. If you want I could try to find his #. I know he's not in you backyard but somepeople like that so ya don't have to deal with local race politics/favoritism.

Dude.. you realize that your LS1 block/engine isn't completely why it makes 25 MPG on the highway right? It's the EFI system that's attached to it. Throw a carb on your LS1 and see it what it gets.

Better yet, throw an EFI setup on a BBC.
Did you know you can run a BBC off the LS1 PCM with an injector manifold, LS1-style TB and coil packs?

Hmmmmmm.... Knocking on your MPG back door....

Need to know the budget of the build really. But as we all say, the valvetrain is where all the money needs to be spent to keep it alive at multiple 8000+ runs.

Bigbronco: What kind(brands/makers/etc) of valve trains were you using so we can get an idea? Would love to have real experiences of living valve trains for multiple passes at 8000+ RPM, it will give us all a good idea at what we and the OP would need for this RPM.

Well obviously it will have to be a solid roller setup. SO, Jesel is a must for the lifters, pushrods, and rocker arms. You're valve springs will need to be at least 1.55" dual springs. 1.625" springs would my my choice though.

When gas cost $4+ a gallon and when your car/truck is'nt a garage queen. Ya'll sound like my dad....bigblock this bigblock that....then he drives a geo metro around to save gas. If ya believe in that shit don't be scared to pay the price to drive it. Op there is a guy around here that builds bbc pullin motors. If you want I could try to find his #. I know he's not in you backyard but somepeople like that so ya don't have to deal with local race politics/favoritism.

why are you in here? seriously go drink a beer.

what brand would be the best for the rotating assembly?

Dude.. you realize that your LS1 block/engine isn't completely why it makes 25 MPG on the highway right? It's the EFI system that's attached to it. Throw a carb on your LS1 and see it what it gets.

Better yet, throw an EFI setup on a BBC.
Did you know you can run a BBC off the LS1 PCM with an injector manifold, LS1-style TB and coil packs?

Hmmmmmm.... Knocking on your MPG back door.....
Then why ain't you doin it......Hmmmmm.....must not be that easy.....
carb = poop......and I said it gets 27-29+ hiway

why are you in here? seriously go drink a beer.

I don't know really. I came across this thread in the new posts section and did'nt pay attention to where it was. I kept getting quoted so I kept replieing.....I usally avoid this section.....and old school motors, god they are horrible. Anyway, I'm goin to drink that beer now.

Then why ain't you doin it......Hmmmmm.....must not be that easy.....
carb = poop......and I said it gets 27-29+ hiway

Just because I don't list all of my cars in my sig does not mean I do not have others little boy. For your info, I AM doing it to my 90 RS.

I have less than a grand into my EFI setup... good game.

And yes, it is extremely easy once you use your brain. I've already posted all the information needed to start the swap in another thread.

You sound like someone who takes a car to a shop, pays them 5 grand to make it fast, then go around claiming you know things about cars when you actually know shit about dick. (You don't even know your own MPG, your just quoting from sources online.)

http://www.ls1tech.com/forums/corvette-performance/882429-fuel-milage-c5-z06.html
http://www.z06vette.com/forums/f4/what-does-your-average-mpg-reflect-114019/

Also, so you put that motor into a car that's HEAVIER than a C5 Z06 by at least 300 pounds and your still trying to claim the same MPG?

Good lord.

Why don't you actually respond to my posts in an intelligent manner and try to debunk my claims like I have done to all of yours?

It's because you can't.

Let me break this down so you can comprehend.

Your comparing a Carb BBC to an EFI LSX.

Let's compare a Carb BBC to a Carb LSX.

BUT, let's really compare an EFI BBC to an EFI LSX.

God, little kids.

If you keep posting dumbass nonsense, I will just report you for posting flame bait in a specific sub-forum.

Stay out.

if your worried about gas prices and milage then this is the hobbie you shouldnt be in go get a pussy hybrid if worry about that shit. i love my gas hog and i like to show my pride in what i got slow or not it rocks.

what brand would be the best for the rotating assembly?

Stay away from anything Eagle, Scat, or the like if you want 8000 RPM and be reliable IMO. Your gonna need some good stuff, a couple of people have chimed in with having regards to building motors that spin this high and wish they would jump back in and advise what their valve train and bottom end consisted of.. cam specs and head flow numbers be damned, I just want the thing to stay alive!

Just because I don't list all of my cars in my sig does not mean I do not have others little boy. For your info, I AM doing it to my 90 RS.

I have less than a grand into my EFI setup... good game.

And yes, it is extremely easy once you use your brain. I've already posted all the information needed to start the swap in another thread.

You sound like someone who takes a car to a shop, pays them 5 grand to make it fast, then go around claiming you know things about cars when you actually know shit about dick. (You don't even know your own MPG, your just quoting from sources online.)

http://www.ls1tech.com/forums/corvette-performance/882429-fuel-milage-c5-z06.html
http://www.z06vette.com/forums/f4/what-does-your-average-mpg-reflect-114019/

Also, so you put that motor into a car that's HEAVIER than a C5 Z06 by at least 300 pounds and your still trying to claim the same MPG?

Good lord.

Why don't you actually respond to my posts in an intelligent manner and try to debunk my claims like I have done to all of yours?

It's because you can't.

Let me break this down so you can comprehend.

Your comparing a Carb BBC to an EFI LSX.

Let's compare a Carb BBC to a Carb LSX.

BUT, let's really compare an EFI BBC to an EFI LSX.

God, little kids.

If you keep posting dumbass nonsense, I will just report you for posting flame bait in a specific sub-forum.

Stay out.

O.k..... Since you decided to accuse me of takeing my car to a shop.....No dumbass, I do all my work myself. I worked on IMSA/Busch/GT/ALMS cars for 18 years. I actually have my own shop painting/fabricating/mechanicing for the last 3 years and I am intelligent enough to know a good thing when I see instead of fucking with the same old junk. If you don't want me to reply stop quoteing me. You have'nt debunked shit. My car don't weight 300# more than a zo6....there you go running your mouth about something you know nothing about. Just so ya know....GM has released their most powerful crate engine to date....and it's a LS 720+hp...check it out. You may want one. Where's your pride Mitch....list it in your sig. Besides I did contribute to this thread...put a oe L88 crank/rods op...I know that's good for atleast 7800.

my pride is win or loose idc i learn from every race. HioSSilver if you were to build a bbc all cast max cubes to 468 single carb no tunnel ram and a manual clutch what would you use? and clutch isnt engaged till 6000 rpm no aftermarket heads or block

I don't run in the pullin truck field. But the local guys like to use the rectangle iron head around here...or atleast they used to. I know a guy that builds pullin truck engines. I could get his #, he has a dyno too. If it were me I would use the L88 shit but in a 468 instead of a 427. That engine was together a long time for my friend, he used a oe L88 intake too. Maybe get a custom grind cam for the application, I personally like a solid flat tappit...they seem to hold up better if your on a budget.

I drive a Ram with a V10 every day so a car with a BBC in my case is no worse on fuel than that, even with a TH350 and 3600 converter. However since you brought it up I'm also doing an EFI BBC that runs on an LS1 computer and it is really pretty simple.

I have to disagree with staying away from Eagle and Scat. Yes, the more expensive components are nicer and sometimes a little lighter or a little stronger but if they say its4340 then it's 4340. As long as you check all machine work and make sure everything is balanced (which should always be done anyway) then I don't see what's wrong with them. Just my opinion.

Finding a stock block to handle what you need is no problem, I think probably any of them would be strong enough. As far as heads you should try to find a set of Bowtie heads, they have factory casting numbers so they are technically not aftermarket and some of boast some pretty impressive numbers.

I fail to see the reason for an 8k motor here. you should be working to a goal of hi mid to upper range torque with a bbc @ 468 in. Is it to be a complete cast iron motor, or are you allowed a factory aluminum head? If limited to cast iron, the early 70s open chamber oval port head would work well, mild port work to match int.gasket,along with a bowl blend of valve seat area,use 2.28 int/1.88 ex valves , top it off with a dart oval port tall single plane and probably an 850 hp holley. you should use good rocker arms, i use crower stainless rockers,along with adjusters(poly locs) the correct legnth to make use of stud girdles. Along with the proper set of valve springs and tiatanium spring retainers. If you can run an aluminum head, use the factory oval port head that came on the 502s and do all the same work mentioned for the cast iron head. As for the bottom end, i have used scat 4340 cranks and their 4340 h-beam rods,for this i would use a 6.385 rod (.250 long) SRP should make a piston for this combo in the 12.5-13.1 comp. range. I think this bottom end would work for ya, same crank/rod combo with a JE piston is in my 565 bbc, thats over 900hp/770torque n/a 14.5 . 1 comp.motor in my 77 camaro. For a cam i would call Comp or erson ask em what best suits your set up / usage. My thoughts would be around .700 lift/ 270 in./280ex@.050 , 110 lc. it should make good power to 7k,and have a good wide powerband.

The 720R crate motor is a 572 (BBC) not an LSX. That's the most powerful GM crate motor yes, most powerful overall, not so much. Look up Scott Shafiroff or Pat Musi just to name a couple. If the BBC really was so bad, why do they keep making new ones (W series, Mark 4, Gen 5, 6, 7)? I'm having a hard time understanding why you've decided to come in here and make a LSX vs BBC argument. BBCs have been proven to make more power, period.

By the way why do you keep telling the OP to use L88 stuff in his 468? The solid lifter 4400-7000rpm cam in the 427 L88 with a 3.760 stroke would not help him looking to spin 8k in a 468 with a 4.00 stroke. The L88/LS6/ZL1 heads would work if he can run aluminum. That's about all he can use from that motor.

OP do you really have the need for 8k rpm more than mid-range power? I'm not too familiar with the pulling world, I can really only give you my $0.02 from a drag racing standpoint. I assume your not looking for low rpm grunt and this is going to be traction limited and through mud right? Where are you spending all of your time rpm wise, 6k and 8k? Ohio crankshaft has been pretty good to me for crank/rods.

I would use GM LS7 rectangle port open chamber heads. Have them ported. The stock 2.19" and 1.88" valve sizes work well. If the motor was 500ci or larger I would use 2.25"-2.3" intake valves. As for the rotating assembly the oe forged crank can withstand 8000 rpm. Its the rods that are neccesary to upgrade. A nice set of H beams and you will be fine. The car in my avatar photo has what started out as a "old" LS7 crate engine. It has the oe forged crank, ATI balancer, Manley h beam rods, oe LS7 forged pistons machined for floating pins. The heads have Manley valves 2.19" 1.88", and were ported by Heinz Bros in Statesville, NC. The valvetrain consists of an Erson roller cam, lift specs IIRC are .698" on the I/E. Jesel roller lifters, shaft rockers, pushrods. Valvesprings are 1.655" Crane's with IIRC 1100# open pressure. Weiand Team G intake manifold, Holley 1050 dominator. With VP110 fuel, and 2 1/8" primary headers this combo made 702hp @ 7800rpm on the engine dyno. The car turns 8000rpm on a regular basis and has been doing this for 10 years.

L88 -wtf they designed a few things after that dumb ass
main advantage of LS is 15 degree heads and 55mm cam core, use that tech on a bbc and see what it does....
It's a pointless argument once you start using aftermarket parts.

OP -
990 casting R ports are the best stock iron head for your stock iron app and easy to find - porting based on budget
Super Victor - ported or Dart/Brodix single plane if the ports are small enough.
worked Dominator
Custom solid roller - don't kid yourself on a shelf grind -search for UDHarold (original CompCams designer) on Team Chevelle and get his phone #. Or let your builder use his phone -need head flow data first-
Calllies, Lunati, or Crower for the rotater. Scat if the builder says they've done it already.
Jesel!

good guy, excellent rep on real BBC board, probably the cheapest of the 4. Lewis Racing Engines (http://www.lewisracingengines.com/)
PSCA regulars Pettis Performance (http://pettisperformance.com/)
Lots of circle track experience among other things BES Racing Engines (http://www.besracing.com/)
Baja and circle track Shaver Racing Engines (http://shaverengines.org/index.html)

Might consider custom crank and genVI 4.5 bore block for shorter stroke, bigger bore, longer rod.

3946074 open chamber heads are the same for L89/L88/ZL1/LS6/LS7, and they are great flowing factory castings. SuperSport, what size is that motor, 427 454?

Its a 454.

The 720R crate motor is a 572 (BBC) not an LSX. That's the most powerful GM crate motor yes, most powerful overall, not so much. Look up Scott Shafiroff or Pat Musi just to name a couple. If the BBC really was so bad, why do they keep making new ones (W series, Mark 4, Gen 5, 6, 7)? I'm having a hard time understanding why you've decided to come in here and make a LSX vs BBC argument. BBCs have been proven to make more power, period.

You need to look again....I did'nt say 720r did I.....I said 720+ 454 lsx. They don't make new ones anymore. Only after market ones.

This is ls1tech right??? and I don't think so....I think you have that backwards. BBC=heavy turd

Almost any Chevy BBC "boat anchor that has any kind of mod internally would proabably drag your ls1 across the ocean floor so why are you in here bad mouthing them?

I just did, GMPP 19244611 454 LSX crate, 620hp/590tq. You said 720 hp crate earlier, which would be 12498827 720R 572 BBC crate 720hp/685tq. GM by the way, still produces BBCs. If I remember correctly, the Gen VII came out in 2001, you can still order a brand new BBC from GM in sizes from 427-572.

Its a 454.

Sounds like it's one mean ride.

Why are people arguing against Big Blocks, in the Big Block section? Go argue against street racing in the Street Racing and Kill section. I bet you'll get the same response.

I just did, GMPP 19244611 454 LSX crate, 620hp/590tq. You said 720 hp crate earlier, which would be 12498827 720R 572 BBC crate 720hp/685tq. GM by the way, still produces BBCs. If I remember correctly, the Gen VII came out in 2001, you can still order a brand new BBC from GM in sizes from 427-572.

They just released it. They did a r version the lsx 454. I saw it in gmhightech.

Almost any Chevy BBC "boat anchor that has any kind of mod internally would proabably drag your ls1 across the ocean floor so why are you in here bad mouthing them?

I highly doubt it....it actually takes a pretty one good just to run with it. How many bolt-on internally stock bigblocks have you seen drive to the track with the cruise/ac on and run low 11's??

I highly doubt it....it actually takes a pretty one good just to run with it. How many bolt-on internally stock bigblocks have you seen drive to the track with the cruise/ac on and run low 11's??

Seen one do it but he ran 10.2s all day. No big.

the block i got came out of a 1 ton chevy 78 the heads i found came from a big block from 1975 to 1985 i havnt got to measure the valves sizes. the block is bored 60 over the intake is victor 454-D the clutch is a ram double disk slipper.
93Z2871805 this sport is pulling a sled that weighs over 100000lbs by time get to end anything under 6000 rpms falls on its face hard

I highly doubt it....it actually takes a pretty one good just to run with it. How many bolt-on internally stock bigblocks have you seen drive to the track with the cruise/ac on and run low 11's??

The most modern chevy big block factory vehicle, I can think of is the 454ss trucks. I have personally seen a friend of mines go mid 13s on bolt ons and a stall in a TRUCK. What is the race weight of your camaro to allow a stock internal ls6 pull low 11s?

I have a lot of respect for the BBC, especially the 540ci and larger ones - can make a lot of power and aren't all that much heavier than some other options.

From what I understand, an all iron BBC is about 90 to 100lbs heavier than an all iron SBC, which is about 140lbs heavier than an all aluminum LS motor - 240lbs or so. But with a high revving BBC, you can really make a lot of power and still have mucho bottom end. More than enough to make up for 240lbs.

The one thing I will say about BBC engines is that when you pop the hood of a car and see one people get intimidated - hard to tell most times if it is a 350hp 396 or a 850hp 540 if you don't know what you are looking at. Not a motor for a sleeper!

I highly doubt it....it actually takes a pretty one good just to run with it. How many bolt-on internally stock bigblocks have you seen drive to the track with the cruise/ac on and run low 11's??

I als know someone with a 79 trans am with a heads cam 454, street driven with air conditioning run 10.0 on his street radials. Please let me know when you ls1 does that N/A. I like ls1s being as I own one, but you make it hard to let your ridiculous comments go.

Need to know the budget of the build really. But as we all say, the valvetrain is where all the money needs to be spent to keep it alive at multiple 8000+ runs.

Bigbronco: What kind(brands/makers/etc) of valve trains were you using so we can get an idea? Would love to have real experiences of living valve trains for multiple passes at 8000+ RPM, it will give us all a good idea at what we and the OP would need for this RPM.

Cylinder heads were an older factory style Pro Topline Aluminum head on a 514" Bowtie BBC block.

All titanium pieces, Xceldyne Ti valves, etc. Mind you, this was a 14:1 compression motor that was also utilizing a Super Victor intake with a 4500 HP Holley that was built by Braswell.

Camshaft was a solid roller from Comp Cams. I believe the specs were 285/295 @ .050 with .900" lift on the intake and .850 on the exhaust side. Offset rocker sizes though that were 1.90 on the intake and 1.80 on the exhaust side. Big triple springs built by PAC. Motor did start life as a 700 horsepower hydraulic flat tappet motor that performed really well in the NMCA Factory Street class. (Flat tappet cam, 477" -8 factory styled cylinder heads and the car still made over 660 rwhp through the TH400. LOL)

Seen one do it but he ran 10.2s all day. No big.

A bolt-on internally stock bbc?..If so that's cool. My car weighs 3100, it is complete with all sounddeading and creature comforts. It has been creativly lightened.:nod:

I als know someone with a 79 trans am with a heads cam 454, street driven with air conditioning run 10.0 on his street radials. Please let me know when you ls1 does that N/A. I like ls1s being as I own one, but you make it hard to let your ridiculous comments go.

Probally not gonna be a problem to do it N/A when the bolt-on ls7 goes in. Keep in mind these are stock ls motors to your h/c bbc. My comment were in retaliation....I spit the truth, sometimes it ruffles feathers.

imho, ls1s are better for a balanced street car but when it comes to making hp and going all out bbc is king. i really dont see how that can be argued (at least the last half)

No ruffled feathers here, I just cant come to grips on how someone would think that a bigger bore, bigger stroke motor will not make more power than the smaller block!?

3946074 open chamber heads are the same for L89/L88/ZL1/LS6/LS7, and they are great flowing factory castings.

I just sold a set of these, they were one of the later castings with the D port exhaust chamber. They had some port and pollish work and in the past had made right around 700hp at 6800rpm on a 468 with a 270-something duration cam and somewhere between 11 and 12 to 1 compression, so I agree these would definetly be a good option.

I highly doubt it....it actually takes a pretty one good just to run with it. How many bolt-on internally stock bigblocks have you seen drive to the track with the cruise/ac on and run low 11's??

I don't have A/C or cruise because I choose not to even though my 73 Camaro was a factory A/C car. I don't drive it to the track because it's 120 miles from my house and I wouldn't drive anything that far to go race it when I have a perfectly good truck and trailer, but that's not to say I couldn't because I have definetely put plenty of miles on it with no problems. Last spring, having never driven the car (which looked like it would never even make it down the track) more than 30mph around my neighborhood I took it to the track and made three passes, on the third it went 11.85@116.2 cam and bolt ons only with steel heads being timed by ear and with an out of the box Holley 830hp, comletely untuned. I guarantee it will go at least low 11s this year and I am going to drive it to the track at least once this year with a few friends just to say that I can.

Cool good running car! No one around here drives their bb anything cars unless it's to a show. You have the typical bb race cars at the track....but to make a dragrace car go fast is easy and I don't pay much mind to them. My car has to pull several duties....or I basically don't want it.

This guy drives his, It's a 565 with twin 88s, enjoy-

http://www.ls1tech.com/forums/multimedia-exchange/1332242-larry-larson-runs-6-95-209-after-1200-mile-road-trip-video.html

OP are you allowed to run anything for a manifold? I understand block/heads are restricted, but what else?

wow. i don't recall anyone saying a damn thing about driving a car anywhere with cruise or a/c. how the hell did they get brought up in conversation about a bbc capable of 8000 rpm?

money and lots of it is what it will take. once you have the 40 grand needed, call a reputable shop and have them assemble it for you.

the quickest/fastest "street" car (and i use the term loosely) that i know of around here is *gasp* a bbc. dude drives it everywhere. it's a pump gas car that runs 8.60s on a dot tire. i love lsx engines. i eat, sleep, and dream of them every day. but no matter how it's played, there will always be someone skull dragging every car you can find...and that guy has a big block setup of some sort.

I just did, GMPP 19244611 454 LSX crate, 620hp/590tq. You said 720 hp crate earlier, which would be 12498827 720R 572 BBC crate 720hp/685tq. GM by the way, still produces BBCs. If I remember correctly, the Gen VII came out in 2001, you can still order a brand new BBC from GM in sizes from 427-572.

Here ya go, their most powerful crate engine ever
http://www.gmperformanceparts.com/pdf/LSX454R.pdf

Very true indeed. GMs highest CLAIMED power LSX engine. Not crate engines in general, just GMs. At 13:1 compression it's 720/720.

This was the stock 572/620 on the dyno at 9.6:1 compression - 700hp/710tq
http://www.chevyhiperformance.com/tech/engines_drivetrain/complete_builds/0704ch_chevy_big_block/dyno.html

Hot Rod Magazine did a dyno test of the stock 572/720R in the June '04 issue, "King Crate" where it made 787hp/725tq on pump gas and 27* timing, then 801hp/738tq on 110 octane with 32* timing. Sorry, but I couldn't get the link for you as the article is 7 years old.

read it again and try to comprehend....They said
720+ HP @ 6000 rpm
720+ LB-FT @ 4500 rpm
Quite Simply the Most Powerful LS Crate Engine Ever from GMPP!
Drag racers take note! GM Performance Parts’ new LSX454R crate engine delivers more than 720 horsepower that will help you stay in front of the competition. More than the most powerful LS engine in our portfolio, it is the most powerful crate engine we’ve ever offered!

I comprehend just fine, the target is at least 720/720 with 13:1 compression. We'll see if it can break 801hp/738tq naturally aspirated on the dyno.

I also comprehend that you sir are dancing around the point by trying to change the debate to MPG, whether it's a GM crate motor, weight, and what new sales pitch they use. Face it the LS is not the most powerful engine ever made and the BBC can, and will always, make more power. Just because YOU have a particular engine doesn't mean it's the best.

If you did read and comprehend then you would have noticed the the 572 720r makes 685 torque compared to 720+ torque (as rated) of the LSX 454 (their most powerful crate engine ever). One has 12:1 the other has 13:1 which means they both need race gas. That makes the LSX more powerful, not a sales pitch. Or since you are the way you are you could choose not to beleive either.
Hell I can't wait for them them to make a better all round package than what I have. I'll go straight out and buy it. I'm not changing anything just stateing facts, and when in fact you find a bbc to be anybetter all round than a ls.....then post it up.

If bbc's are so great should'nt you be swapping in one of those in your camaro instead of a ls?

I was trying to tell you in my previous post Hot rod tested the 572/720R at 12:1, then backed up the timing to 27 degrees, and made 787hp/725tq on pump gas. I'm putting a Gen III in my 4th gen and not a BBC because of a few reasons. 1) The torque of a BBC would twist this car in two, if I wanted a 7 second car I would. 2) The engine bay is cramped and plugs are hard enough to change with the LT1, 3) I just want something different, I already have a BBC car, and plans for another one when the 93 is done.

The 572 is still rated at 720 from gm....so I guess your saying that the LSX could be underated to and make even more power than the 572......good call, I like it. Maybe someone will do a independat test of the LSX.
On the subject of your 93.....I can tell you that car is built WAY better than anything gm ever put a bbc in.....so I would'nt worry about twisting it.

Who gives a shit about crate motors?

Did you even notice that the BBC was dyno'd on pump gas (Post #71) and still made the advertised horsepower? I guarantee that LSX wont do that. So now were comparing race gas crate motors to pump gas crate motors. Do you honestly think backing the timing down on 13:1 will be able to run pump gas? HAHAHA.

HioSSilver, with you riding nuts on crate motors so much, I literally do not beleive you worked for ANY shop for ANY number of years that was worth a damn because crate motors are for suckers, or people who need an insurance claim.

I went through your posts, and all you do is cheddar-cheese your cars while running a full race clutch and think your car is some kind of badass. I COMPLETELY see why your car gets what it gets, and it's pathetic you resorted to that and still go on about "daily driver, AC, 30 MPG".

I wouldn't drive your car on the street to the crusher. And 9/10 people wouldn't daily-drive a SOFT LOC, FACE PLATED T-56. Why is it you don't post these two mods in your sig?

Because noone would give a shit about your times if you did and you can make yourself seem a lot better driver. I even thought you were a damn good driver until I read you use a soft-loc clutch and a face-plated trans. If you can't drive a manual with these two baby-sitters on your car, you just suck.

I don't give a shit if your man-woman drives your car on the street either.

Im going to quote something that shut you up once.

I know some pretty young guys that are crew chiefs on fighter aircraft...so they work on high performance, military aircraft for a living. That doesn't mean they are qualified to make engineering/design choices that could affect the safety of the aircraft. Your 16 years of experience (or "experiance" to directly quote you) doesn't mean you made the best choice for a daily driven car. I don't think what you did was warranted for the relatively small weight savings you saw, nor do I think it was a well thought-out decision. But since you are happy, that is all that matters. I'm just glad you don't live near me so I don't have to worry about your car falling apart as you drive down the road next to me.

In all honesty, if you wanted a lighter frame, you probably should have started out with a better platform.

I've reported you for flame bait. I hope you take a vacation, but I know it won't go that far.

OP I'm sorry your thread took such a detour.

HioSSilver, if you would like to continue discussing the finer points of the BBC please feel free to start a thread in the appropriate section of the forum. I'll see you there!

93Z: Im requesting the thread be cleaned up, even my posts be deleted, this thread has some GOOD information in it pertaining to spinning over 8k but you gotta sift through the idiot replies. Would like to keep it going as well.

I don't use a softlock clutch .....its a Tilton triple 5.5......shows what you know about crate motors......and the people that bye them. Funny how u report me yet I haven't made any derogatory statements about anyone. Unlike you

Back to the original topic:

8000 rpm out of a 468 isn't anything special, go to your local dirt track engine builder. A stock GM crank is fine, probably some steel rods, and some light pistons would be nice, but not mandatory. Lots of roller cam profiles for BBC can do what you want, about the only fancy part required is good valve springs.

Take a look at the piston velocity, it really isn't that bad.

Those dirt track guys sure do know how to build a motor to rev! I definitely agree on the steel rods and higher end spring package, but I'd also say to have some lightweight and strong rockers. Not necessarily shaft mount, but chromoly or aluminum with a girdle. And yes twinturbo496, the piston speed isn't that severe.

93Z: Im requesting the thread be cleaned up, even my posts be deleted, this thread has some GOOD information in it pertaining to spinning over 8k but you gotta sift through the idiot replies. Would like to keep it going as well.

Gotcha, I'd like to keep it going too. Someone asked a question, so they should get the answers they came for.

You guys are forgetting the easy answer to any of the LSX trolls trying to hate on the BBC. The correct rebuttal is: "Small blocks are for boys."

OP, when I was planning out my motor, I was thinking of a screamer 496. In the end, it turned out that adding cubes was going to be more cost effective at making more power than adding revs. I went with a all aluminum, 24* headed 632 ci BBC instead and it will keep running flawlessly until I'm pushing up worm turds.

Just food for thought.

You guys are forgetting the easy answer to any of the LSX trolls trying to hate on the BBC. The correct rebuttal is: "Small blocks are for boys."

OP, when I was planning out my motor, I was thinking of a screamer 496. In the end, it turned out that adding cubes was going to be more cost effective at making more power than adding revs. I went with a all aluminum, 24* headed 632 ci BBC instead and it will keep running flawlessly until I'm pushing up worm turds.

Just food for thought.

He is limited to 468 and OE heads in the class he wants pull in.

He is limited to 468 and OE heads in the class he wants pull in.

I figured I was missing something at 4am.