Feuling Endurance Valve Spring kitsFEULING ENDURANCE BEEHIVE valve springs are a direct bolt in replacement up to 650 lift (Twin cam Evo XL) and 565 lift (M8) camshafts no spring seat machining required. Machined from a premium grade Hi tensile chrome silicon single conical ovate wire, shot peened with a specially processed thermal heat treat and super NexTex finish to give these valve springs the needed fatigue life to exceed the high demands of V Twin engines from stock to
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