Closed chamber with flat tops

That's what I wanna hear. I realize it is by no means a radical cam and should not see clearance issues and didn't know about the open/closed valve height...thanks.

The exception to the Rule!..... if these heads were an open chamber head that was cut down to create a closed chamber, Your Valve to Piston clearance is a lot closer now.
What is the part ## on these heads.

How many thousandth is the piston in the hole at TDC.