Camshaft Experts

I'm not entirely sure... I bought these pistons 25 years ago. They are forged flat tops and I had the iron closed chambers at the time
You need to know what those #'s are, valve to piston clearance, and what intake centerline that cam is installed at. With intake valves that size, Newbomb's spec is 8° tighter & advanced 3°, plus if You add more rocker ratio...those intakes are going to be popping open way sooner & higher. This is no time for guessing about it, it needs measured before doing anything else.