If you mean is .010 safe as far as valve interferance, yes it's safe, i've went farther, but if you're going radical on your cam i'd check clearances.David Vizard is best known for his V8s, mostly road race and NASCAR engines. Have you ever just milled a head and no other changes in your set up, and then tested it? I said more can be gained with camshaft tuning, longer duration, etc. There's a lot of urban rumors about how much power you gain with each mod you do to a engine, for instance, bored .030, people expect big HP gains.In our 240s you're only gaining about3 cu. in. with a .030 overbore , our engines make about 1 hp per cu. in., so you're only going to gain about 3 hp from the added displacement, the power increase you feel is from the improved ring seal. I've been with a circle track team 18 years now, mostly sbc's When we do the engines, it's 5 hp here, 10 hp there,etc. but soon it begins to add up to a big difference. It isn't any one mod that's going to win races, it's a complete intergrated package that does it.