gearhead1186

iTrader: (8)

I kno exactly what you mean.. I have listed question after question over at chevelles.com and my most recent post about ls vs bbc somehow turned into sbc vs ls and there was no turning back so i decided to give it a shot here and im glad i did..

the 632 sounds so tempting esp with a nitrous shot... but i think the same can be achieved with a adding an i/c to a procharged 540 and dialing the boost to say 15-16 from say 8-10... ahh here come another night of no sleep hah

on a side note.. do you kno if the dart big M or GM Bowtie BB allow you to use a thrust plate to hold in the roller cam instead of a button.. googling didnt give me a clear cut answer

Quickin

There's a section on this site thats called "Small Block & Big Block Chevy Specific"....they know their **** over their.

Now go there and drive'em nuts like I have many times.


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NemeSS

iTrader: (127)

imo i will never build a sbc or a bbc for personal use in any of my vehicles
ever again, it will be lsx for me or nothing,

but u cant argue the power to price ratio for a built bbc, thers no replacement.
a 502+with a hp holley dp and solid roller will be hard to beat.
i would go with a hi compression, solid roller, killer flowing heads and intake
and a plate even for the street.

Bink

4 link

IFRYRCE

iTrader: (3)

Wow...

A 427 LSx will WHIP a 427 BBC. The ENGINE is better, and cube for cube, there's no contest. The fact that the BBC can be expanded for more cubes (only a matter of time before the tall-deck LSx takes 'em down, too) doesn't make it better, it makes it bigger. Not saying the BBC isn't a good engine, but there's a reason we're using 6.0s and 6.2s in Trucks now instead of the old 8.1L BBC.

That quote of yours is true, but the LSx is FAR superior to a BBC.


Back on topic, I personally wouldn't want nitrous. Big cubes with or without forced induction will get you what you want, but big cubes and nitrous enough to support means spending as much time filling the bottle as you do squeezing it. I like your procharger idea, I've been struggling with how to have a nice-driving high HP car on the street for a while, and FI with adjustable boost is what I keep coming back to.

gearhead1186

iTrader: (8)

ya i dont want to deal with filling up bottles all the time.. i have a 75 shot on my 2000 prelude (which im trying to sell) and its a hassle even to fill that as often as I do.. I can only imagine with a 150+ shot.

I like the procharger idea because the boost built motor will be very mild when off the boost. this way i can actually enjoy it on the street instead of sliding everywhere. two separate tunes?? so what thats what EFI is for..

Greg Fell

iTrader: (9)

a bbc will stomp all over an ls motor all day every day. sorry guys, i love ls motors just as much as you, but as we all know, its all cylinder heads. a good bbc cyl head can flow damn near 500 cfm. mix that will big big cubes and well....

Greg Fell

iTrader: (9)

wanna bet? put some big chief heads on a bbc and run any head you want on an ls 427 and see what happens.

ss dave

Great topic, I was in the same boat about a year ago. What to plant in my 69. Went with a NA LS7 for several reasons. Less weight= better handling, better feel and less is more in straight line acceleration. Reliability, consistency; I didn't like changing jets messin with timing, fickleness of weather changes, bowls/floats etc. I like getting into my car and knowing it will run the same in January as in July. Obviously I'm not a mechanic, but still you have to appreciate the reliability of computer controlled FI.

New performance stuff all the time is being developed for the LSx's, exciting cutting edge stuff: not only on the mechanical side but also electronics. Alot of R&D is going into these engines. In the near future you may be able to have 700rwhp and get 20+ mpg.
Now the drawbacks are expense, but if your considering a swap with a 600+ ci powerplant your expense will probably be equal. You will need upgrades in the front clip, fuel, cooling, tranny, driveshaft, rearend. For a street car that sees occassional strip, an LSx.
Now if you want to pop the hood and have everyone say "wow thats big" then a BBC.

Stang's Bane

iTrader: (22)

Granted, the BBC has better heads available to it. However to take advantage of the better breathing, you must turn more rpms, and there goes your reliablility out of the window.

CI is CI it doesn't care what block it is out of. Are there better heads for the BBC, yes, no question. However, a given number of CI will only be able to use a given amount of airflow at a given rpm.

WS62001

My vote would be 540 w/ Procharger. No way would I run a 4.750 stroke on the street very much at all.

Quickin

Wonderful....another case of an internet member twisting my words. Who ever said "cube-for-cube"?????? Not me.

We're talking about an LSx which is basically maxed out at around 447-454ci, and 481ci for the tall decks, compared with what the thread starter is talking about for his '70 Chevelle....a big *** 540ci BBC with a Procharger...or even the 632ci N/A BBC.

Gimmie a break.

And, the point I just made is moot anyway, just for your info....cube-for-cube a BBC 427 will KILL any LSx 427. Its all about the heads and intake, apparently you don't know what BBC heads can do. The LS7 heads are total GARBAGE compared to the heads available for BBC.

Good luck even hanging close to a BBC 427 with any LSx 427.

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WS62001

OR, you could always do something original, and use a 10.7" deck and a 5" stroke and have 665 inches. Possibilities are endless. You have enough room for a 11.100 deck with conventional heads I would guess.

slow trap

iTrader: (22)

how about turbocharging the 540 ? it's very easy to change boost levels.
just throwing another idea out there to rack your brain,haha.

Stang's Bane

iTrader: (22)

Love how we have changed the thread from "How would you build 1000 hp" to "ultimate power potential" LOL

cam

iTrader: (9)

I didnt read this whole thread but having been a former BB chev guy I must admit that there really is no comparison to the LS engines with regards to just about everything IMO. Durability, reliability, ease of build, cost, not to mention the absurdly good tune ability of the LS platform.

1000 hp out of a BBC would probably cost as much or more than 1000 hp out of an LS so that point is pretty much moot.

1000 hp BB chev is going to be a pavement pounding white knuckle hella car ( not that this is bad if this is what you want )

My tuners car is a 347 cube LS with an F1C procharger that put down 930 rwhp. The thing is completely civilized and hauls *** like nobody's business. Thats a lil 347....

Start with a 427 LS and see what happens.

When I think back of how many times I was into that BBC to set my valve lash... The dang valve train on BBC's suck *** to put it mildy this is where all the problems with them are ( or at least begin )

For a restoration or a pure intimidator street machine I can see the appeal of a big block. For worry free performance and pure speed fun I cant for this its LS power allllllllll the way

PICNIC_GEORGE

iTrader: (3)

Three pages and the first guy to even bring up this idea... I hear something about 650hp street tune and 1000hp track tune. Then I read some garbage about leaving the belt off the blower? How would that accomplish 650hp or even run right? That's a big airflow block when the blower is not spinning. I'm sure 1000hp would be cheaper and easier to make on a big inch BBC 540-632 cid. I like either idea personally. As long as it's a chevy motor. But turbos are the only way to go if you want to have multiple tunes ready to go and not use nitrous.

And gearhead are you trying to convince us or yourself what way is better? You seem stuck on the 540 procharged, Go with it. It will work either way you'll be happy.

scatillac

iTrader: (12)

Discounting the better technology, the weight loss alone is worth it. Almost 300 more pounds takes a lot more to start things going and makes for a really grim front to rear weight distribution.

I believe that my wet sump LS7 complete weighs about the same or even a little less than an iron big block complete short-block assembly.

But if you want a monster (500+ cid) drag engine or just love giving your money to ARAMCO or Exxon-Mobil, go with the big block.

Quickin

Whats the difference in weight from the original iron block that came with the '70 Chevelle, compared with an aluminum BBC today? Not much I would guess.


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KHShapiro

iTrader: (10)

Quickin, while i have agreed with most of the things you posted, i do not agree with your statement about how an LS will never be as good as a BBC.
They already are. stock vs stock LS series is on another level.
Aftermarket is catching up rather quickly, i belive you can do what a 455 with an MID LSX.
Lets really talk about head design. valve angle , cost , weight, ect, ect.

How much is an EFI set-up for an BBC?
Injectors will be the same price, ECM same, intakes ?, exhaust?.....
Parts for parts everything is close depending on the block you want to use.

and yes a LS7 is better than a BBC 427.

here is a link to check out a sample of pricing complete with Fuel injection ( big block)http://www.sdparts.com/catalog/crate...RamJetEng.aspx

an LS7 is what 11k complete, most of these BBC are long blocks rated at 502hp, and how close in price are they with out dated tech.

Yes you can get more CI with a tall deck BB, yes there is much more aftermarket support of a BBC, but real world app, LS all the way.

10.5 Dave your what 7 sec car... that very very impressive. a forerunner. i have no doubt you have had your share of set-backs, but things wil only get better. LS will evolve into much much more or a new platform will arise.

just my opinion