OK so I got to thinking about this, pulled those heads from the attic and CCd them at 64 CC and can easily take .080 off before getting close to the valve, I could even throw in some old 1.88s and still mill .070. The PR pinch is wider than a magnum head and has a hole drilled for it instead of the raw casting like the magnum so it could be opened even more... from past experience I know I will have to slot the PR hole larger side to side to fit a roller cam motor (or go flat tappet) but that will not restrict the pinch width. I would just need to figure out how to drill the bolt holes for the kegger (backwards jig?)and find pushrods, rockers, 1.88s...


Just filling and eyeballing the level till it just barely covered the intake valve gives me 52 CC chambers. Plugging that into KB calculator with .030 quench gives me 12.2 compression. Maybe I can find flat valves to get a tiny bit more....