Chain drive. This Feuling M8 camshaft kit includes chain drive camshaft; Race Series lifters and a cam installation kit that includes cam bearing; cam/crank hardware and a gasket/O-ring kit that allows for install of the factory one-piece pushrods. Feuling recommends the optional 993528 Feuling one-piece heavy duty HP+ pushrod kit; with 0.165" wall thickness. Feuling rocker box fastener kit 707450 is also highly recommend to help prevent cylinder head cracking; this kit replaces the rocker shaft bolts with studs and nuts to help reduce the stress on the rocker shaft standoffs.472 CAM - The 472 Reaper is a great all-around camshaft and Feuling’s go to for 4 ½ stroke 114" - 117" looking for a little more than our 465 grind and wanting a bolt-in. The 472 has a great bottom end with substantial gains above 2;900 RPM when compared to stock. Responds very well to increased bore and or compression; exhaust system and air cleaner. Use of performance valve springs is not required but may result in a quieter; smoother running valve-train See Feuling 993530 or 588021.Kit includes 993525 camshaft only. Valve Lift Open Close Duration @ 50" lift @ TDC Lobe CenterlineIntake .468 8 BTDC 25 ABDC 213 .117 98.5 Exhaust .472 50.7 BBDC 7.75 ATDC 238 .110 111.5RPM ran