Dyno Cams Camshaft 308 Grind, Tool Steel Billet, GX390, Predator 420cc

The 308 is a great all-around cam. It features a wide powerband and great "pulling" characteristics. Upgrading the valve springs are mandatory. If your rules allow, upgrading to a billet connecting rod and flywheel is also mandatory. A carb with a 1.33" or 34mm venture is recommended. The use of big valves is highly recommended. Tool Steel Billet cores are the best choice in high RPM applications. The two piece design of the Tool Steel Billet core allows you to advance or retard the cam to meet your application needs. Specs Engine: 390cc OHV Clone 13HP Recommended Class: Modified Target (MAX) RPM: 7200 Spring Pressure (In / Ex): 48-50 lbs Dual Spring Valve Lash (In/Ex): .003" Ignition Timining: Pump Gas Not Recommended 110 Octane 32 Deg BTDC Methanol 36 Deg BTDC Compression Ratio: 12 to 1 Profile Intake Exhaust Open: 53.5 BTDC 91.0 BBDC Close: 91.0 ABDC 55.1 ATDC Lift: .308" .308" C/L: 108.0 ATDC 108.0 BTDC DUR @ 50: 244.2 Deg 244.6 Deg