P.Wallnuts

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.

quick77

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.

93Z2871805

iTrader: (5)

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.

93Z2871805

iTrader: (5)

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.

SuperSport01

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.

TurboS10

iTrader: (12)

L88 -wtf they designed a few things after that dumb ***
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
PSCA regulars Pettis Performance
Lots of circle track experience among other things BES Racing Engines
Baja and circle track Shaver Racing Engines

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

93Z2871805

iTrader: (5)

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?

SuperSport01

Its a 454.

HioSSilver

iTrader: (8)

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.

99peweterls1

iTrader: (1)

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?

93Z2871805

iTrader: (5)

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.

93Z2871805

iTrader: (5)

Sounds like it's one mean ride.

deelong4002

iTrader: (8)

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.

HioSSilver

iTrader: (8)

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

HioSSilver

iTrader: (8)

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??

3.8redbird

iTrader: (3)

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

Mitch383LT1

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

99peweterls1

iTrader: (1)

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?

Paul Huryk

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!

99peweterls1

iTrader: (1)

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.