hey guys, i put a wild cam in my a-12 and the cam cutter said i need to skim 1-2mm off my head to give me the right compression( it's at 150psi now). what do you think? have any of you skimmed your heads that much?

many thanks
nicholas
south africa

You would be better of getting a thinner gasket. Why remove healthy metal?? If you were to skim the head, you would then need a new gasket, so why not just get a new gasket???

Your builder probably meant shave the head and use a thin gasket. 1mm isn't much, but 2mm is more than a thin gasket alone will accomplish?

I think you can shave about 6mm inch off an A-type head and not ruin it -- anyone know for sure? But the word is that a closed-chamber (heart-shaped) head is better if you want high compression.

Have a look at an a-series cylinder head & you`ll notice two casting depressions along one edge of the head-gasket sealing face.
These look like thumbprints.
The manufacturer purposefuly put them there to guage maximum machining tolerance.
When these thumbprints disappear,the cylinder head is at minimum thickness & is no longer servicable.
Hope this helps you?