Reaper® Camshaft - Chain Drive - 487 Series - M8Good for 4. 25" stroke with 114" 117" engine looking for an agressive bolt in Produces a wide powerband 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 valvetrain. Cam specs measured in the engine on the lifter @ 0. 050 using a 1. 61 rocker arm ratio. Feuling does not recommend tuning beyond stock emissions standards.