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308 Grind, Welded Lobe, Clone 13HP
308 Grind, Welded Lobe, Clone 13HP
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308 Grind, Welded Lobe, Clone 13HP

Item Number 308-GX390
Qty Break Price
1 $135.00
2 $128.75
3 $122.50
4 $116.25
5 and up $110.00


  • 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.
  • The lobes are welded to increase durability, extending the life of this cam.


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