Those are some strange looking pistons.
The valve reliefs go down into the piston, then the 50cc domes come up into the combustion chamber.
I was asking if a 362 could be dropped to a 330
Oh, I see.
Cup V8 is restricted to a 106.3 mm (4.185 inch) maximum bore, a 5.86 liter (358 cubic-inch) maximum swept volume, a 90° crankshaft, steel conrods, a single valley-located camshaft, flat tappet cam followers of no more than 22.2 mm (0.875 inches) diameter, pushrod & rocker-arm valve actuation using steel pushrods and aluminum or steel rockers, (approved) aluminum cylinder heads with two valves per cylinder
358 = 8 * (π * (2.0925²)) * s
358 = 110.045 * s
S = 3.25" stroke
4.185 bore + 3" crank = 330 cubes
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Our setup
8 * (π * (2.175²)) * 4.25 = 505.3 CI
8 * (π * (2.25²)) * 4.25 = 540.75 CI
8 * (π * (2.3²)) * 4.25 = 565.05 CI
8 * (π * (2.3²)) * 4.5 = 598.28 CI (these exist...way, way out there)
505 cubes, .040 head gasket, 115 cc chambers, 50cc domes, .004 deck height, cam set at 108 degrees with custom grind for our setup, mechanical fuel injected (methanol), and dart aluminum heads that have had alot of touching.
at BDC = 63.125ci + 115 cc chambers + .040 x 4.38 gasket = 1034.43 cc's + 115 cc's + 9.86cc's = 1159.29 cc's
at TDC = 65cc chamber + .040 x 4.38 gasket + .004 x 4.35 deck = 65cc's + 9.86 cc's + 0.98 cc = 75.84 cc's
1159.29 / 75.84 = 15.28:1 compression ratio
