The bore diameter is not an issue. There actually is a good selection of pistons 3" to 3.5" if you are willing to go to custom rods. What I was interested is the centerline to centerline of the bores. For example inline chevy 6's are 4.40" from bore to bore. Rocker ratio is of interest, I don't think I have 2 good rockers on this engine, clearance is huge but afraid to adjust it as valves have eaten a pocket into most of them). Was thinking of a reasonable way to replace them, but need to stay close to the existing ratio to avoid messing up geometry and finding pistons with the valves. Suspect it's around 1.5:1, but suspecting and knowing are different. And while we're talking about it, anyone know the factory compression height (pin centerline to top of piston)? Looking at it it looks tall even with the piston well below 0 deck.
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