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308 Grind, Tool Steel Billet, Clone 13HP
308 Grind, Tool Steel Billet, Clone 13HP
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308 Grind, Tool Steel Billet, Clone 13HP

Item Number 308-GX390-TSB
Qty Break Price
1 $200.00
2 $190.74
3 $181.48
4 $172.22
5 and up $162.96


  • 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.


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


Open: 53.5 BTDC91.0 BBDC
Close: 91.0 ABDC55.1 ATDC
Lift: .308".308"
C/L: 108.0 ATDC108.0 BTDC
DUR @ 50:244.2 Deg244.6 Deg