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Here's the key to keeping the costs down: RHS' new iron cylinder heads. RHS has part numbers for the LA-style, shaft-mount rocker system or the later-model, Magnum-style, pedestal-mount rockers. RHS sells the LA heads bare for $318 apiece (the Magnum versions cost about $50 more). They have 62cc combustion chambers, 179/67cc runners, and are designed to work with 1.92/1.625-inch valves.