My buddy just ordered 2 mm oversized valves against my better judgement, he has an h22a prelude, and I think that since the valves are larger that he will have clearance problems with the valve reliefs on the piston! If you know please respond! WILL 2MM OVERSIZE VALVES FIT INTO THE STOCK VALVE RELIEFS ON THE PISTON OR WILL THE VALVES CONTACT THE PISTON!???

 

Valve job will be needed and he may have valve to piston clearance issues......I suggest claying the motor to find out.
http://www.c-speedracing.com look in the how to section.

 

i think he will need new valve seats to make those valves work.