whats are the stock size valves in a 90 iroc 5.7 TPI i'm bulding heads for a friend what the biggest valve i can put in and be a daily driver. I need INtake and exhust sizes thanks

 

The stock 1.94 and 1.50 valves will flow more than enough for the 350. The way to help flow and gain good hp (30 hp or so) is to follow the instructions linked at the end of my sig.

 

OldsGuy,

The largest valves I've seen in a stock 23° non-splayed valve SBC head without serious edge shrouding problems are 2.11/1.77". I'm not even sure if those are stock sizes any more at Manley, but they can probably custom make any valve you need. They used to be stock Pontiac valves, and are close enough in length to work without guide modifications. They install a little taller, but with higher lift cams, that turns out to be a good thing.

 

hmm thanks