POPEN gx390 Grind Camshaft, TSB, Big Block Clone

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The P-Open is our #1 camshaft that is intended for a full tilt modified or open class for Big Block Clones. 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 carburetor 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



  Intake Exhaust
Open: 71.0 BTDC 89.0 BBDC
Close: 87.8 ABDC 50.0 ATDC
Lift: .363" .367"
C/L: 106.0 ATDC 110.3 BTDC
DUR @ 50: 263.3 Deg 269.0 Deg