Dyno Cams Camshaft P-Open Grind, Welded Lobe, GX390, Predator 420cc

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. Specs 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 Profile 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