Oversized valve

[lsi-crvtec]

Is it a big gain to go oversize valve, its a b16 head.....wanna take it to the machine shop to port and polish it but while its there i would just go ahead and go 1mm over......What are the gains is it worth it????

[RBS]

their worth it . . if you have high compression pistons and cams and all that goodstuff

[BTEC]

skunk says not to do oversized valves depending on the size of the cams and the compression of the pistons bc when u get to high lift the valves are pushed closer to the pistons. id get a 5 angle or radius valve job instead of bigger valves to help the air get into the cylinders easier than going oversized, but thats just me. ive never done either yet so im speaking on my theory.

[Postman]

i kept stock size valves for my turbo gsr.

[BTEC]

i kept stock size valves for my turbo gsr.
same for my turbo b16

[lsi-crvtec]

okay thanks......I wanted to go 9500 rpm so i was just wondering...i have a garret 60-1 and im looking for 500hp thats possible right

[lsi-crvtec]

One more thing, con dual valve spring work on stock valve or they r too weak??

[B18c1Turboed]

okay thanks......I wanted to go 9500 rpm so i was just wondering...i have a garret 60-1 and im looking for 500hp thats possible right
I would upgrade the springs and retainers, I made 660 on the same turbo,with a 100% stock type r head. I reved to 9k only!

[lsi-crvtec]

thanks man