rpm exaust valve opening?

[TRS]

what are your thoughts on changing them on a stocker with 170 pisg ( has head and fix kit so not really stock) cranking comp at 3400 ft? I ride mostly 5000-8000

thanks

All I can say is WOW. 170psi. Pump gas? Decompression hole plugged? Give them a try.

 

[Ultrasauras]

exhaust springs

All I can say is WOW. 170psi. Pump gas? Decompression hole plugged? Give them a try.

avgas/ prem PA head 13.6-1 plus MTNKT fix kit I said wow to when i checked after also.