Valve/Valve Spring Specifications
VALVES & VALVE SPRINGS SPECIFICATIONS
| Application |
In. (mm) |
| Intake Valves |
| Face Angle |
| 4.0L |
45° |
| 4.2L |
29° |
| Head Diameter |
| 4.0L |
1.91 (48.5) |
| 4.2L |
1.792 (45.52) |
| Minimum Margin |
.031 (.79) |
| Minimum Refinish Length |
| 4.0L |
4.827 (122.61) |
| 4.2L |
4.7945 (121.780) |
| Stem Diameter |
| 4.0L |
.312 (7.93) |
| 4.2L |
.3725 (9.462) |
| Valve Tip Maximum Refinish |
.010 (.25) |
| Exhaust Valves |
| Face Angle |
| 4.0L |
45° |
| 4.2L |
44° |
| Head Diameter |
| 4.0L |
1.5 (38) |
| 4.2L |
1.411 (35.84) |
| Minimum Margin |
.031 (.79) |
| Minimum Refinish Length |
| 4.0L |
4.827 (122.6) |
| 4.2L |
4.7945 (121.780) |
| Stem Diameter |
| 4.0L |
.312 (7.93) |
| 4.2L |
.3725 (9.462) |
| Valve Tip Maximum Refinish |
.010 (.25) |
| Valve Springs |
| Free Length |
| 4.0L |
1.82 (46.2) |
| 4.2L |
1.99 (50.6) |
| Pressure |
| 4.0L |
| Valve Closed |
66-74 @ 1.625 (29.96-33.59 @ 41.2) |
| Valve Open |
205-220 @ 1.2 (93.07-99.88 @ 30.48) |
| 4.2L |
| Valve Closed |
64-72 @ 1.76 (29.38-32.69 @ 45.4) |
| Valve Open |
188-202 @ 1.411 (85.35-91.71 @ 35.84) |
| Installed Valve Spring Height |
| 4.0L |
1.625 (41.29) |
| 4.2L |
|