S&S CYCLE 129" Power Package Engine Performance Kit — 129", bore 4.320", stroke 4.375", black – 18-23 Softail, 17-23 Touring, 22-23 CVO
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Converts a 107" oil-cooled M8 to 129" with big-bore cylinders, matched cam and oil pump, MLS head gaskets; works with the stock crankcase.