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Jims 727K Manual Compression Release Valve

Demon’s Part # 90000020988 Mfg. Part # 727K


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Give your starter a hand by installing these in your high-compression, big-inch motor. Simple drill and tap (10mm x 1mm) each cylinder head and thread in the self-sealing release valves (thread tap sold seperately). Sold in pairs. Made in the USA.