The following table provides general guidelines for street/strip engines with a hydraulic flat tappet camshaft.
| Engine Type | Seat Pressure | Open Pressure |
|---|---|---|
| Stock Small Block | 105 - 125 lbs. | 220 - 280 lbs. |
| Moderate Performance Small Block | 260 - 330 lbs. | |
| Stock Big Block | 115 - 130 lbs. | 220 - 280 lbs. |
| Moderate Performance Big Block | 260 - 330 lbs. |
Tips & Tricks
- Use Screw-In Rocker Arm Studs with valve spring open pressures over 280 lbs.
- Open pressures over 280 lbs. can loosen press-in rocker arm studs.
- Most manufacturers will recommend valve springs to go with each cam they make.
- We recommend using these springs, or a spring with similar specifications.