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Then Jeff drove them home and torqued the ARP rod bolts. You may have noticed a bit of a dome on that piston. It’s actually a 50.00cc dome, and that, combined with a 0.041-inch head gasket compressed height, 120 (-ish) cc open chamber cylinder heads, and the pistons sitting 0.009-inch below the deck, yields a 12.53:1 compression ratio. Get the race gas ready.