| Spark Advance Maximum |
40-44 old style heads::: 34-36 with Vortec Heads::: and 32-34 with 18* |
| Oil Temp Maximum (in pan) |
270* with convential oil, 290* with Synthetic oil |
| Minimum Fuel Pressure |
4-5 PSI carb'ed |
| Minimum Piston Ring End Gap |
Top, .018";;; 2nd, .016";;; Oil, .016" |
| Rod Bearings |
.002"-.003" minimum; .00.010"-.020" side clearance |
| Main Bearings |
.002"-.003" minimum; .005"-.007" endplay |
| Quench Area |
.035" minimum, .040" recommended max |
| Valve to Piston Clearance |
.045" below 6250 rpm, .080"-.100" for max RPM applications |