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 |
