Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Valve Spring Installed Height
Installed height (length) of spring must not exceed specifications listed in table below. Measure height from surface of cylinder head pad to underside of spring retainer. If spring length is greater than specified, install.030" spacer on head under spring to bring spring length within limits.
| Application | Installed Height | |
|---|---|---|
| 1968-69 302" | 1 5/8-1 11/16" | |
| 351" | 1 25/32-1 13/16" | |
| 1970-71 302" | 1 5/8-1 21/32" | |
| 302" BOSS | 1 13/16-1 27/32" | |
| 1972 302" | 1 21/32-1 23/32" | |
| 351" | 1 3/4-1 13/16" | |
| 1973 302" | 1 43/64-1 45/64" | |
| 351" | 1 49/64-1 13/16" | |
NO RELATED
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.