ZZ4 valve cover clearance......
Melting Slicks
Joined: Apr 1999
Posts: 3,264
Likes: 3
From: Toms River NJ
Re: ZZ4 valve cover clearance...... (corvette0096)
depends on the ratio....i have zz4 and 1.6 roller rockers. no problems here....
if you have a problem, you can takethe cheap route, or the pretty route.
Cheap: use 2 gaskets...no one will even be able to tell.
Pretty: Gm sells a centerbolt to standard style conversion kit so you can use normal valve covers, and from there you can get a set of tall covers, and even the conversion kit will probably raise it enough and you can find a nice set of regular covers.
but like i said, I have no problems
if you have a problem, you can takethe cheap route, or the pretty route.
Cheap: use 2 gaskets...no one will even be able to tell.
Pretty: Gm sells a centerbolt to standard style conversion kit so you can use normal valve covers, and from there you can get a set of tall covers, and even the conversion kit will probably raise it enough and you can find a nice set of regular covers.
but like i said, I have no problems
Thread Starter
Race Director
Joined: Aug 2000
Posts: 11,506
Likes: 4
From: Vancouver,Wa.
Re: ZZ4 valve cover clearance...... (74VETTE)
What rockers are you running? I have read that the rockers the come with the GM hot cam kit will fit with no problem. Taller covers are out of the question, They will hit my Super ram runners. One more thing is that 306hp at the rear wheels? 1.5's is what i have.
[Modified by corvette0096, 5:26 AM 5/2/2002]
[Modified by corvette0096, 5:26 AM 5/2/2002]
Drifting
Joined: Sep 1999
Posts: 1,411
Likes: 1
From: Wylie TX
Re: ZZ4 valve cover clearance...... (corvette0096)
I don't know what the ZZ4 valve covers look like, but I am running the pro magnum rockers with .589" lift under '89 L98 Firebird valve covers. I had to use two gaskets (I RTV'ed them together) and I had to cut out the upper (as it sits on the head) brace inside the VC, but it works fine with no leaks.
Melting Slicks
Joined: Apr 1999
Posts: 3,264
Likes: 3
From: Toms River NJ
Re: ZZ4 valve cover clearance...... (corvette0096)
yea corvette0096, thats 306HP at the rear wheels. I dont think youll have a problem with 1.5: roller rockers.....its when you step up to a higher ratio you have problems I think.
Pro
Joined: Nov 2000
Posts: 594
Likes: 0
From: Tucson AZ
Re: ZZ4 valve cover clearance...... (corvette0096)
The GM 1.6 Roller Rockers will fit under the ZZ4 valve covers with no problem. A friend of mine with centerbolt heads and Crane Gold rockers had to modify the centerbolt valve covers to get the shaft which supports the bolt to fit between adjacent rockers. The GM rockers are tapered and not as wide and the valve cover bolt shafts fit between the rockers just fine.
