Ken Lally

Not too happy with my current AR smallblock setup, thinking, big... big block that is, I have read that the ramjet has clearance issues, so now I am thinking ZZ572.

Has anyone dropped this engine? Want some seat-of -pants feedback.

KL

Corvus

It's possible but I heard it's a PITA and I'm not sure you'll be able to run headers with that, and you gonna have to change to a better Tranny, and rear end to take that power.


AND bushings, and brakes too ( if you wanna live ).

I believe that engine has 680hp, and there's a 720hp version too.

Les

The milder version is rated at 620 HP but really makes mid 600s. No real life experience here but I did see Jay Leno's old Buick (56 or so) on TV w/ the 620 HP 572. That car is HEAVY but it flat flew when he nailed the throttle. Of course he has gobs of money for the mods required to make it work.

MassVette

The 572 won't clear any available Corvette aftermarket hood- it's too tall...
plus you'll need to have custom headers and custom 3 1/2" exhaust fabricated because of the raised block deck height.
The ZZ/502 crate in my '79 clears the underside of the L-88 hood by about 1/4". And it's not a tall deck block, either. So stock headers & exhausts will fit.
After removing the 195 h.p. 350 and going the 500+ h.p. 502, it felt like I was driving a kamikaze go-kart!

Personally,
I'd NEVER go back to a small block.

If I had it to do again, I'd probably buy a 540 Merlin.
Same hp as the ZZ/572- and less $$$$............ plus its a 9.8" standard deck height block- and it has a mechanical fuel pump boss, along with the forward clutch pivot boss that's required for any Corvette installation.

Garys 68

What about clearance with the power brake booster? With the additional deck height and tall valve covers (roller rocker arms), it might get a little tight.
Gary

MassVette

More than tight. It won't fit at all.
Here's a pic of the 502 with Cal Custom valve covers in the 79 engine bay. And they're shorter than the CHEVROLET covers!

jpatrick636

I have exactly 1" clearance at the brake booster. Even if you could make the valve covers work, the headers would be impossible on the drivers side. It's pretty close to that with the 502. However, impossible is inversely proportioal to dollars spent.

Simmo

Ohio Crank list a 588 on a short deck. 4.625 x 4.375 I think. A tall deck would be too much hassle. I need to start saving for one of these.

GDaina

That's a looooong rod for a short deck....that piston has to be paper thin....I don't know if that is a workable solution...

I think 4.25" stroke is as much as you can go on a std deck block...anything more you have to start grinding huge gobs of metal from the bottom of the bore holes to clear the rods...making that area paper thin and prone to cracking and H2O in the pan.....

0Rick@Moroso Performance

Ken,

I am in the process right now of putting a ZZ572/620 in our '68. I have a set of Hooker headers that we are going to run until we can make a set ourselves. The needed a decent amount of massaging to make them not touch the frame.

There is no way I can use a vacuum power brake booster. There is only about 4 inches from the center of the mount on the firewall to the valve cover. I am going to use a Hydroboost unit that gives boost from the power steering pump.

I bought the deluxe package that includes the intake and carb, etc. Without an air cleaner on the carb, my L-88 hood sits on the vent tube of the carb, holding it up about 1/2 an inch.

Everything else seems ok.

A few weeks back there was a post about the 572. Here is the link. http://forums.corvetteforum.com/showthread.php?t=980199 At the bottom of the second page is a pic of one in a '71. It seems to clear the brake booster in that car. He also states that his buddy put a different intake on it and it clears the '73 hood he has on it. I don't know what it has for exhaust.

We dynoed ours here at work. Right out of the crate it made 672 hp, and 710 lb/ft of torque on 93 octane. Our dyno is fairly conservative compared to others.

I hope this info is helpful. There are a few pics on our website. Moroso Racing

Rick

lostpatrolman

that thing sounds like it is a monster....

GDaina

You can run Hooker Super Comps under chassis style headers or leave them uncapped if it's a race car...if you're putting this on the street, then 3" pipes to the mufflers will work just fine. There are very very low restriction mufflers on the market....

427Hotrod

You might check with Steve (632C2). I know in the past he has used a tall deck block in a C-3. I think he had some tricks to get it all to work.

He's good....he's even managed to get a tall deck 632 in a C-2 with Big Chief heads, 2-3/8" headers, full exhaust, dry sump oiling etc etc in a street car. Unreal...

JIM

Paul L

Have a look at this 1967. Love the mirror: "Objects In Mirror Are Probably Fords."

http://www.allmusclecars.com/project...2_corvette.htm

http://www.allmusclecars.com/video/6...20corvette.wmv

Jughead

0Rick@Moroso Performance

It is a streetcar. What I didn't mention is that they are hooker SIDEPIPE headers. I think normal ones would work fine.

Rick

Gordonm

Rick when you get this done I am going to have to drive up there just to see this car. Are you going to have it at the shop? I just have to see and hear this beast!

68/70Vette

It looks like a lot of people knowledgeable about high technology engines and the ZZ572 have either bought one or would like to.

I'm curious about the internal balance. Is there an issue with internal balance of these engines? The BB 427 crank is naturally internally balanced, and I know that the 454 crank can be internally balanced with heavy metal inserts into the crank throws. I've read in other posts that engines that are not internally balanced can cause premature wear with the internal crankshaft bearings.

If I buy a 572, I will never be putting 100,000 miles on the engine so if there's a question about premature wear of the engine bearings, this in itself is not a problem for 572 owners. Do people with 572's try to internally balance them as best possible, or do they rely exclusively upon flyweel and damper counterweights?

No balance problems???

GDaina

There's no need to add Malory metal to an external crank...just buy an internal balanced crank.....regardless the stroke...the price is the same. Use 427 harmonic balancer and the flywheel or flex plate for internal balanced motor.

wacked

572,,,, Old Caddy motor. I would love to put one in wacked. I gots to do something with it.