[WILMASBOYL78]

Good info Jim...I'm not a machinist and I was tryin to say what you mentioned about the valves and the grinding. I have always been kind of in the closed chamber world and should have deferred to the OC users. I'm going to check some of the heads I have in the shop to see if I have any of those numbers. What's your opinion on the hardened seats?? some folks don't use them..they say a good stainless valve is sufficient. I really enjoy the discusson of BB ideas....always good stuff. Thanks for setting me straight. tom