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