valve clearance?
Thread Starter
Melting Slicks
Joined: Feb 2002
Posts: 2,613
Likes: 0
From: Winston Salem NC
valve clearance?
Is anyone running anything like the following. I'm wondering if there will be any valve clearance problems?
Z06 heads with 11-1 CR
228/228 588/571 112 0 adv.
2.02/1.57 valves
Z06 heads with 11-1 CR
228/228 588/571 112 0 adv.
2.02/1.57 valves
Safety Car
Joined: Sep 2003
Posts: 3,558
Likes: 2
From: Cape Coral FL
Are you getting 11:1 CR with a .060 MLS or .052 graphite head gasket? I would think at 0 advance you won't have any problems, but it would be wise to check. AFR has found up to .025" variance on the deck height of typical production LS1's. Apparently the stock spec for this is +-.0125? If you are running a graphite gasket and had a low deck you would be close, and also have a higher CR than you expect, and vice-versa for a high deck and MLS gasket. I'm doing a very similar upgrade to yours but with AFR's and similar cam. I was advised by AFR to be aware of the deck height and it could be an issue in certain cases. I have been told to always check P/V when installing a large cam. Just passing it on. 
Thread Starter
Melting Slicks
Joined: Feb 2002
Posts: 2,613
Likes: 0
From: Winston Salem NC
Thanks guys. Glad to be able to find similar mods. I will check PTV clearance. I don't want to buy a notching tool unless I need to. So it looks like I can hold off buying one.
I'll be using stock gaskets and having the heads milled. They are Z06 heads.
I'll be using stock gaskets and having the heads milled. They are Z06 heads.
Last edited by gojo; Aug 3, 2004 at 04:16 PM.
Safety Car
Joined: May 2003
Posts: 3,814
Likes: 105
From: Dearborn Heights Michigan
Running a near identical set up but with LS1 heads and 1:8 rockers, same valve lift. Had to grind a bit clearance at several spots in the valve covers.You will be able to tell immediately if there is a clearance problem!
Fred K.
Fred K.
Thread Starter
Melting Slicks
Joined: Feb 2002
Posts: 2,613
Likes: 0
From: Winston Salem NC
Originally Posted by FKING1
Running a near identical set up but with LS1 heads and 1:8 rockers, same valve lift. Had to grind a bit clearance at several spots in the valve covers.You will be able to tell immediately if there is a clearance problem!
Fred K.
Fred K.
My cam will be the same. The change I'm making , relating to clearance , will be to go from 10.6 CR to 11.0 CR by milling.
Thread Starter
Melting Slicks
Joined: Feb 2002
Posts: 2,613
Likes: 0
From: Winston Salem NC
Originally Posted by Patches
I'm running 5.3 L heads milled .030" @ 11.3: CR, 2.02/1.58 valves, .578/.578 112 w/ 0 adv. 229/229
No clearance issues at all.
No clearance issues at all.
If they took off .030 they must have unshrouded the chambers to get down to 11.3?
Last edited by gojo; Aug 3, 2004 at 08:24 PM.
"AlohaC5" Senior Member
Joined: Jun 2003
Posts: 3,562
Likes: 44
From: Madison, AL
I have similar heads and am moving up to a bigger cam. What are the rear wheel HP and TQ numbers with your cam? I was considering the 225/225 .589/.589 114. Thanks 
Originally Posted by Patches
I'm running 5.3 L heads milled .030" @ 11.3: CR, 2.02/1.58 valves, .578/.578 112 w/ 0 adv. 229/229
No clearance issues at all.
No clearance issues at all.
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Thread Starter
Melting Slicks
Joined: Feb 2002
Posts: 2,613
Likes: 0
From: Winston Salem NC
Originally Posted by AlohaC5
I have similar heads and am moving up to a bigger cam. What are the rear wheel HP and TQ numbers with your cam? I was considering the 225/225 .589/.589 114. Thanks