The 315 lobe design is the next step above our proven 308. With slightly more lift and increased duration, the 315 will make more top end power for an OHV modified engine. This cam requires an upgraded spring package, billet rod, and billet flywheel. SpecsEngine: 212cc Non-Hemi PredatorRecommended Class: ModifiedTarget (MAX) RPM: 9000Spring Pressure (In / Ex): 34-36 lbsValve Lash (In/Ex): .003"Ignition Timing: 34 Deg BTDC ProfileIntake ExhaustOpen: 49.80 BTDC 99.65 BBDCClose: 98.80 ABDC 63.05 ATDCLift: .3135" .3135"C/L: 108.0 ATDC 108.0 BTDCDUR @ 50: 249.65 Deg 253.40 Deg