I assume the the valve lash clearances quoted on my solid roller cam card do not take into account my aluminum heads. The engine is a small block ford with AFR 185 heads. Are there any recommendations on how much to add to the lash figures when cold to get it in the ballpark. The engine operates @ 190F.
Actually the lash setting listed on the card is a hot setting, as that is the best way to set it. Since it is a hot setting you would not have to change for an aluminum head. If you must set it cold then generally we recommend going .006 tighter on the setting for an aluminum head.
Comp Performance Group
I have a 351W/408 cid engine with aluminum heads. I had 12 of the 16 rockers fail. I have since up graded to the gold comp rockers rockers to accompany my comp solid roller cam and comp roller lifters. When I checked the valve lash before disassembling the heads I found the valve lash was 0.041 intake and 0.048 on the exhaust and another set was 0.041 intake and 0.038 exhaust these were the surviving rockers. The engine builder kept the cam card and now he has moved and I can't find him. How do I find out what the original valve lash was supposed to be?