Valve Spring Installed Height
Spring ends must be square within 5/64". Installed height of valve spring must not exceed specifications. Measure height from surface of cylinder head pad to underside of spring retainer. See Fig 1. If height is greater than specified, install 0.030" spacer on head under spring to bring height within limits.
CAUTION:
Install spacers only if necessary. Do not use more than 2 spacers, as this will overstress springs and overload camshaft lobes.
VALVE SPRING INSTALLED HEIGHT
| Engine | Installed Height | |
|---|---|---|
| 302" | ||
| Int. | 1 43/64-1 45/64" | |
| Exh. | 1 37/64-1 39/64" | |
| 351" W | ||
| Int. | 1 49/64-1 51/64" | |
| Exh. | 1 37/64-1 39/64" | |
| 351" M & 400" | 1 13/16-1 27/32" | |