Valve Spring Installed Height
Installed height of valve spring must not exceed specifications listed in table below. Measure height from surface of cylinder head spring pad to underside of spring retainer. If height greater than specified, install spacer on head under spring to bring height within limits.
CAUTION:
If more than 2 spacers are used, an overload on springs and camshaft will result.
Valve Spring Height
| Engine | Installed Height |
|---|---|
| 429", 460" | 1 51/64-1 53/64" |
| VALVE SPRINGS | |||
|---|---|---|---|
| Engine | Free Length | PRESSURE (LBS.) | |
| Valve Closed | Valve Open | ||
| 429", 460" | |||
| 1968-70 | 2.03" | 76-84@1.81" | 240-266@1.33" |
| 1971-72 | 2.068" | 76-84@1.81" | 217-241@1.33" |
| 1973 | ..... | 71-79(a) 1.78" | 161-177(1) 1.39" |
| 429" BOSS | |||
| 1970 | 2.03" | 88-96@1.82" | 300-330@1.32" |
| 429" CJ, SCJ, P | |||
| 1970 | 2.079" | 85-93@1.82" | 294-318@1.36" |
| 1971-72 | 2.03" | 88-96@1.82" | 300-330@1.32" |
| 460" PI | |||
| 1973 | ..... | 88-96@1.82" | 300-330@1.32" |