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If you want to make good power, then you need a great set of heads. These CNC-ported L92 heads (PN SD8765, $799 ea.) from Scoggin Dickey Parts Center (SDPC) feature 70cc combustion chambers, stock valves, Manley locks, and titanium retainers. On the intake side, these heads flow 345 cfm at .600 and 350 cfm at .700 lift according to the gearheads at SDPC.