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Posted by Talyn, Jul 23, 2013
Cylinder Head & Short Block - 4G63 cams, valvetrain, pistons, rods, stroker kits, 6-bolt swaps, hybrids, etc. Read this Forum's Strict Guidelines.
The 2g head on a 6 bolt block is common enough.
Factory stock valves will have 6T cast into the head.
It's common for valves to kiss pistons in a 6 bolt block 2g head combo? sh** i didn't know...
Now i got another thing to have in the back of my mind.
Valves should not be making contact with the pistons at all.
Its possible that the head was shaved, bringing them closer to the pistons. Too much shave, without a thicker head gasket will cause them to slap. But Im pretty sure if they make marks in the piston, it would bend the valve.
Do you remember how much it was shaved? And the head gasket that was ran?
Also, are you sure that they pistons arent indented, like the stock ones?
As most stock cams I have measured come in about .330 lift.
So looking at the "Cams Zeroed" measurements then add another .060 clearance,for the smaller lift stock cams, the head will have to be milled .200 appox.
Glad i misread