Safe Valve Pocket Depth

1968rt said
Flat top speed pros have almost 1/2" of aluminum on top. Plenty of room to notch them.

I recently checked a set of Speed Pro's for a BB Chevy, they were right at .300 & Speed Pro said no thinner than .240.... Obviously not the one I took a picture of.... But that's my mill & my piston vise... And a piston from a engine I sold many years ago...