What is my compression with L2316 pistons

I thing them are the piston that i have in my 340. have lasted a vary long time. BUT when i check valve to piston clearance with 474/280 Mopar Performance cam.

The valve relieves, on the piston , had a lip at the end of it causing me to not have enough valve to piston clearance.

took that lip off and had over .120" valve to piston clearance.

As has been said before, there are better option out there.