Curious as Im looking at a set of heads, is a 2cc valve relief common amoung aftermarket pistons? These are a flat top piston that these heads are working on now. The heads have 2.10/1.60 valves.

Trying to understand the likely hood of them clearing my 383 bottom end, only issue is I dont exactly know the details on my pistons.

 

Given a stock deck height of 9.025 inches and 55 cc heads , you'll have compression right around 12.5 :1 on a 383. but a flat top with 2 small valve reliefs is pretty common with that size. I'm using a 12cc dish and a "0" decked block with a .040 gasket on my set-up(383). It runs on 91 fine.

 

Oh forgot to add, as far as valve clearance, you just have to mock-up and check it with clay ( I like blue playdoe)

 

Piston to valve clearance is all in the cam......

 

so when the valve hits the piston with .600 lift.....

Why not just mock it up and see if your reliefs need enlarged?

 

well thats what you do. If its close.