Valve Shrouding Q's

Cudafever said
As a general rule, the less the valve is shrouded the better. But i have found, that if you get real crazy with it, it can really mess up the way the air travel through the port. I only have experience with the J,X, and early emission 360 heads.

That is why i asked, as this is the only ones that i could give you more then theory on.

I guess I'm not answering you question but i don't have any cold hard fact on this. My guess is around .020 on valve to valve and as far as shrouding goes i would say .020 at .100 lift and continuously enlarging as the lift goes up.

Unfortunately you can't do that as the head gasket surface is in the way.(were talking intake valve here)

sorry i didn't mean to be rude, whether you took it that way or not. thanks for those specs, gives me some reference material to start plotting!

RustyRatRod said
I think the whole valve shrouding thing is way over thought. Plenty of performance engines came from the factory with what would be considered valves that were shrouded all to hell, but they ran like gangbusters. I am sure the argument will ensue since I said it, but that's my thought.

well i think its safe to say those said engines would run harder if the shrouding was relieved and compression corrected. That said i think if a valve was big enough over the stock valve the gain in area minus the shrouded area would probably still be more giving gain.