This cam is a great drop-in cam to increase power with no modifications.Requires an upgraded spring package, billet rod, and flywheel.Stock OEM lift with big duration.The lobes are hardened for extra durability, extending the life of this cam. The 224cc camshafts have .550" main journal sizes. The cams have been clearanced between the lobes and feature narrow lobes. These modifications allow for rod clearance due to the 58mm stroke. The compression release is also thinner to clear the 58mm crank counterweight. These camshafts work with Harbor Freight Predator 224cc and Tillotson 224cc engines.SpecsEngine: Harbor Freight Predator 224cc, Tillotson 224ccRecommended Class: Mild ModifiedTarget (MAX) RPM: 7000+Spring Pressure (In / Ex): 18 lbsValve Lash (In/Ex): .003"Ignition Timing: 32 Deg BTDC ProfileIntake ExhaustOpen: 46.3 BTDC 83.0 BBDCClose: 82.7 ABDC 44.0 ATDCLift: .2245" .231"C/L: 108.5 ATDC 110.0 BTDCDUR @ 50: 245.7 Deg 245.5 Deg