On an 84mm gsr or ls block....with high compression pistons and gsr head...how would the valve to piston clearance be affected....isnt bad already with a b20 block

 

the bore size of the pistons has no affect on piston to valve clearance.

its your piston dome displacement, head gasket thickness, camshaft lift and valve size that will determine the valve to piston clearance.

if you have a piston with a really big dome on it you should have the engine clayed to make sure you have proper clearance.

 

Yea that is the right way to do it...but since we are talking about a honda here that everyone has done it already...im was just wondering what would i need to have good clearances if i have a 84mm sleeved b18 block with a gsr head with sum 10 or 11 and sum change c/r pistons and sum skunk 2's or sumthing like that you get me....just wanna knowwhats safe and wat isnt