I am in the process of putting a B16 head on a B20 block with JE 11.5:1 pistons. Since the bore size on the head is 81mm and the bore on the block is 84mm, will the after market pistons hit the head? Thanx

 

it isn't the sides of the chamber you should be worried about it is the valves, make sure you clay the motor since B20/vtecs are iffy on clearence anyway

 

I'm running skunk 2 stage 2 cams. Do you think this will be a problem? How high should I rev??

 

thats all up to u man, i would just clay the motor if i were you.

 

if the head isnt super milled(i know, lame term) you shouldnt have to worry about the pistons hitting the valves... the cams are big but it will have a good amount of clearence....

you dont have to worry about the piston hitting the head because of 84mm sleeves...the chamber area has enough room to clear it.

 

Is there anything I should do to the block before installing the aftermarket pistons?

 

are you installing them? or a machine shop? u might want get it honed.....