buffed1978

Will the new 572 big block from chev fit the frame of a 78 vette.Has any one done this yet.Iam going to put a new engine in my 78 and Iam leaning towards the new 572 big block.The reason for the 572 is that you get over 600hp and that is right from the factory.

Gordonm

Not with the stock hood it won't. You had better have some real heavy duty components behind that motor. Plus all the big block pulleys, rad, and so on. It is not a bolt in for a 78 but it will fit. Plan on tearing up some rear ends and trannys unless you go with some HD components. It should be a wild ride when done.

NHvette

I think there might be clearance issues with things like power brake booster.

Sounds like fun, though !!!

LOTAHP

Check this out !!!!

http://hotrod.com/techarticles/engin...454/index.html

norvalwilhelm

I would love a 572 short block and bolt my top end on it if it would fit. Is there a web site for this???
I imagine the blocks are all the same externally, dimensions that is.

Brettmc

I bleve the 572 is a tall block. You'll have problems finding headers for it.

Brett

WESCH

Hi

This would be 9,4 Liters.
Will the fuel consumption raise proportional to the raise in CI of a engine ?

Happy new year. Gunther

MYBAD79

There is always a way to make something fit... everything can be done.....

I would expect you'll have a ton of problems after this engine is installed: tranny, driveshaft, rear end - these components will all break with that monster under the hood....just curious what's breaking first.....

9.4 liters - this is insane... but fun...

MotorHead

I would not look at it like a weekend motor swap, more like a major overhaul because you have to beef everything up from the flywheel back with a torque monster like that.

trevkris2

Wheeeeeeeee!!!!

70_Shark

Probably the U-Joints(could be bad). Get it to work and it will be a rocket on wheels. I would love to feel those G's. Even with a 502, I hope I never hook-up completely.

Hvymtlc5

You will never get the passenger side head off without butchering (cutting away) the AC/heater box - the back head bolts are blocked (you could pull the motor.....). I had to cutaway some of the box and re-fiberglass it to give me room to get the tools in there. Had no problems with the drivers side, steering or brake booster.

PRNDL

Is that the same engine Jay Leno put in his old Buick? Forum member Rick Moroso (?) bought one for a 68.

68/70Vette

I think I've read some posts were the opinion was stated that a stock C3 (1968 to 1979) IRS could survive 650HP if you didn't abuse it (i.e. didn't drag race). If I'm not correct, I think that maybe the comment was that the stock differential could survive 650 HP. Anyhow, if you're really thinking about big HPand using that HP agressively, you have to go to the 31 spline axles with the really large U-Joints. Just the axle and differential output yoke assemblies will run about $2150. Also you can expect to pay about $2000 plus for a differential upgrade for the new half-shafts. New 4 inch half shafts will be another $???. With a lot of horsepower, you'll most certainly have to upgrade the drive shaft. From what I've been told, if you don't get to agressive, your stock IRs will survive 600 HP. However, if you have that much HP, it seems likes you're really going to have to upgrade the powerline to really enjoy the power.

I've seen the U-joints for the really big C3 IRS upgrade. Amazing - they look something like out of the drive line of a cement mixer truck!! I can't imagine that anyone could ever break of these u-joints.

redc3

the way i see it, its like a harley. if ya gotta ask, you dont need to know. ( or something like that ). if you gotta ask if it will fit, do some more research or a smaller project at first. but then again, with all the help youll get from here, dive right in man! im currently dropping in a 383 in front of my keisler 5 spd. MAN i thought i was gonna go fast. youll out run everything, but a gas station and the bank!

69 N.O.X. RATT

The 572 is a tall deck.

I will be the buzz killer here, the GM 572 completely unimpresses me. 650 hp or so from 572 inches is nothing to be proud of. If you have a look at the heads and other components they are pretty unimpressive for the price also, no thanks.

David Ey

Check out this months HotRod Mag. (Feb.2005)
There is a great article about the GenIII and the Vette irs.

Ex_F-Body_Enthusiast

There's 2 versions of the 572 crate; the "620 HP" hyd. roller and the "720 HP" solid roller.

In the June '04 Hot Rod rag, they put the 12.0:1 solid roller version on the engine dyno. After going to smaller air bleeds on the King Demon, they acheived 801 HP @ 6300 RPM, and 738 lb-ft @ 4500 RPM on 114 octane race gas and 32 degrees of timing.

Then they tried 91 octane gas and backed the timing down to 27 degrees. They still got 787 HP @ 6500 RPM and 725 lb-ft @ 4600 RPM.
I'll take the solid roller and run it on 93 octane!

69 N.O.X. RATT

I have seen dyno runs of the 620 version making closer to 650-680 hp, still pretty pitiful, especially for 13,000.00 bucks. A buddy of mine bought the Scott Shafiroff pump gas 540, 690 hp on pump gas with Dart heads and intake for 9,995.00

Our own foum member 427Hotrod's pump gas 540 makes 825 hp. Granted there is a lot of R and D in his motor, but none the less it makes more power the "race" version 572.

The 572 is over priced by about 4,000.00

LFZ

along with alot of other HP GMPP crate motors.