Notching pistons, how far can you go?
So my Teksid 2v is in the final stages of machining. The shop mocked up the 2v heads on the Mark VIII short block today, to check PTV clearance. With my Comp 270s, the valves just barely kissed the piston. The guy told me I needed .080" notched into the piston. But the problem is, the pistol crown thickness is only .25", so it'd leave me with .17". He is uncomfortable with how little material would be left, but of course it's up to me in the end. The pistons are stock Mark VIII hyper pistons.
After researching all day, I've read many things. .15" is minimum, it'd be fine with no boost, or you shouldn't notch hyper pistons at all. What say you?