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POpen Grind, Welded Lobe, Clone 13HP
POpen Grind, Welded Lobe, Clone 13HP
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POpen Grind, Welded Lobe, Clone 13HP

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


  • The P-Open is our #1 camshaft that is intended for a full tilt modified or open class. This cam offers larger duration with a lower lift. If your looking for a great cam, look no further.
  • Upgraded valve springs, billet rod, and billet flywheel are mandatory. A caburetor with a 1.50" / 38mm venturi is recommended.
  • The lobes are welded to increase durability, extending the life of this cam.


Engine: 390cc OHV Clone 13HP
Recommended Class:Modified / Open
Target (MAX) RPM:8000-8200
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:12.5-13.0 to 1 or Higher


Open: 71.0 BTDC89.0 BBDC
Close: 87.8 ABDC50.0 ATDC
Lift: .363".367"
C/L: 106.0 ATDC110.3 BTDC
DUR @ 50:263.3 Deg269.0 Deg