TLDriver

iTrader: (4)

I am going to be installing the 272 cams in my 2jz-ge head and I know I should upgrade the retainers and springs but how I figure out what valves to get? From what I have read some people say it's not needed to swap them out, some say they should and some saying going with the 272's and highers they are a must because of the extra stress at higher rpms. I was on the BC site and they offer all of these:
STAINLESS STEEL VALVES
BC valves are made from premium stainless steel, fully machined and swirl polished for ultimate air flow. Dished head for added weight savings and increased valve control at high rpm. Standard and oversize head.
Part # Description #
BC3300 33.6mm Intake (standard head diameter)
BC3301 29.0mm Exhaust (standard head diameter)
BC3302 34.6mm Intake (+1mm head diameter)
BC3303 30.0mm Exhaust (+1mm head diameter)
BC3304 34.1mm Intake (+.5mm head diameter)
BC3305 29.5mm Exhaust (+.5mm head diameter)

My current ge head is clean and has no damage and everything is near perfect. Are the +.5mm or +1mm if I was/were going to be boring it out and polishing? any recommendations on what to do or route to go on? TIA

TurboB6

Are you planning on doing head work? If not your only options are the standard size valves.

TLDriver

iTrader: (4)

I am thinking of boring out the intake inlet, the exhaust holes. cams, cam gears (doesn't apply) and the retainers at the moment. Other then that I don't have anything planned yet... what else can be done?

TurboB6

Sure, you could do valve guides, seals, shimless buckets. On the valves you would have to redo the valve seat if you did an oversized version.

TLDriver

iTrader: (4)

cool thanks I guess for my build the stock size would be my best bet.