The DynoCams 356 is a high lift modified grind that is very capable of extreme RPMs. This cam has very aggressive ramps and requires an upgraded spring package, billet rod, and billet flywheel. For use with Tillotson or larger carb.Engine: 196cc OHV CloneRecommended Class: ModifiedTarget (MAX) RPM: 8500-9000Spring Pressure (In / Ex): 36 lbsValve Lash (IN/EX): .003"Ignition Timing: 36 Deg BTDCINTAKELIFT: .3555Dur @ .050": 254.3 Deg. C/L: 108 ATDCEXHAUSTLIFT: .3555DUR @ .050": 254.5 Deg.C/L: 108 BTDCTHE LOBES ON THIS CAM ARE WELDED.Processed and ground by the hard working employees of DynoCams in the USA.