Myth or reality...I'm putting a JDM GSR (B18C1) in my EG, I'm also putting Skunk2 stage 2 cams, now my question is, if I put SIR pistons, will the piston come in collision with the valves? Urban legends say that they will but I wanna ask the pros...thx

 

you will not have any problems.

peope put pct civic type r pistons in there gsr blocks all the time.
and those are domed alot more than the p30's

 

SIR = p30's Right?

You'll be fine, my friend is running CTR's in his block, with stage 1's, you will be fine.

 

I am using that cam/piston combo in my LS/VTEC engine. It has true JDM sir P30 pistons and S2S2 cams. No clearance issues at all.