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. 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 and do not use more than two spacers (more than two will overstress springs and overload camshaft lobes).
| Engine | Installed Height | |
|---|---|---|
| 302" | ||
| Int. | 1 21/32-1 23/32" | |
| Exh | 1 19/32-1 5/8" | |
| 351" W | ||
| Int. | 1 49/64-1 13/16" | |
| Exh. | 1 19/32-1 5/8" | |
| 351" M & 400" | 1 13/16-1 27/32" | |