Feuling 538 Cam For Harley The 538 CAM is a loud, aggressive camshaft. In engines with large diameter cylinders, changed cylinder heads, intake, compression, and exhaust, this camshaft accelerates quickly and pulls strongly. For engines with an increased compression ratio of 124 cubic inches and above, the Reaper 538 grind is a great fit. Although they are not necessary, ported cylinder heads look great with the cam and increase pulling power all the way up the range. Features: Aggressive power with a nasty sound RPM range 2,350 - 5,975 Ported cylinder heads are not required but will complement the cam High lift valve springs required Heavy Duty one piece pushrods are also highly recommended Made in the USA 538 Cam Info: Intake open/close 20.5/38.5 Exhaust open/close 48/18 Intake duration 239 Exhaust duration 246 Intake lift at TDC .180 Exhaust lift at TDC .157 Intake lobe centerline .99 Exhaust lobe centerline .105 Intake Lift .538 Exhaust Lift .542