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

Item Number 356-GX390TSB
Qty Break Price
1 $200.00
2 $190.74
3 $181.48
4 $172.22
5 and up $162.96


  • The 356 is capable of extreme RPMs. With its early valve opening, larger lift and wider duration, it's a proven winner. Upgrading the valve springs, a billet connecting rod, and billet flywheel are mandatory. A carb with a 1.41" or 36mm venture or larger is highly recommended. The use of big valves is also 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 / Open
Target (MAX) RPM:7600-7800
Spring Pressure (In / Ex): 65 lbs Dual Spring
Valve Lash (In/Ex):.003"
Ignition Timining:Pump Gas Not Recommended
110 Octane 34 Deg BTDC
Methanol 38 Deg BTDC
Compression Ratio:12.5 to 1 or Higher


Open: 51.6 BTDC94.0 BBDC
Close: 93.5 ABDC54.8 ATDC
Lift: .3555".3555"
C/L: 108.0 ATDC108.0 BTDC
DUR @ 50:254.3 Deg254.5 Deg