Valve Stem-To-Guide Clearance
If hole gauge is not available, use.005" brass shim (1/16" wide) in valve guide bore. Tip of shim should extend toward push rod side of head and not more than 1/4" into guide. If valve stem will enter guide, clearance is excessive.
If stem-to-guide clearance is excessive, valve guides should be reamed to next oversize, and valve with corresponding oversized stem installed. Service valve available in standard (.343") and.003".006".013" oversize stems. Reamers are available as follows:
| Oversize | Part Number |
|---|---|
| .003" (.346") | J-5830-1 |
| .006" (.349") | J-5830-6 |
| .013" (.356") | J-5830-7 |
NOTE:
Valve guides and valves of.003" oversize may have been installed at factory. They will be indicated by a "3" stamped on cylinder head gasket surface, in line with oversize valve. Oversize valves are so marked, in ink, on valve head.
| VALVE SPRINGS | |||
|---|---|---|---|
| Engine | Free Length | PRESSURE (LBS.) | |
| Valve Closed | Valve Open | ||
| 1968-73 | |||
| 472" & 500" | 2.250" | 60-65@1.946" | 155-165@1.496" |