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Sidewinder® .650" Valve Spring KitInclude springs, upper and lower collars and keys For valve lift to .650" with 1.860" /178 lbs. installed height, 376 lbs. at max lift Max 6500 rpm Made in the USA EU: For valve lift to 1,65 cm with 4.72 cm /80,74 kg installed height, 170,55 kg at max lift