whats the standard head thickness of a 2wd sierra sapphire cosworth?where is it measured from and what is the minimum thickness you can have before the valves clip the pistons?also if the head is too thin is there a head gasket that is thicker that can be used?cheers,lee

 

139mm is unskimmed (i think )

measure on the cam face

good read about heads and thickness etc
https://passionford.com/forum/showth...highlight=head

 

brilliant,cheers for that!