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| VALVE SYSTEM SPECS | |
|---|---|
| CLEARANCE – COLD Intake Exhaust |
.016" .016" |
| CLEARANCE FOR TIMING (INTAKE) | .020" |
| OVERALL LENGTH Intake Exhaust |
2 7/8" 2 7/8" |
| STEM DIAMETER | .6245" to .6240" |
| CLEARANCE IN BLOCK | .0005" to .002" |
| TIMING – INTAKE Opens Closes Duration |
9° BTC 50° ABC 239° |
| TIMING – EXHAUST Opens Closes Duration |
47° BBC 12° ATC 239° |
| VALVE OPENING OVERLAP | 21° |
| INTAKE VALVE Material Length Overall Head Diameter Angle of Seat Stem Diameter Stem-to-Guide Clearance Lift |
SAE 5150 5.797" 1.531" 45° .373" .0007" to .0022" .351" |
| EXHAUST VALVE Material Length Overall Head Diameter Angle of Seat Seat Insert Material Stem Diameter Stem-to-Guide Clearance Lift |
Uniloy 21-12 5.797" 1.47" 45° Eatonite EMS 58 .371" to .372" .0025" to .0045" .351" |
| SPRING FREE LENGTH | 2 1/2" |
| SPRING PRESSURE – STANDARD Valve Closed Valve Open |
53 lb. @ 2.109" 120 lb. @ 1.750" |
| SPRING PRESSURE – SERVICE MINIMUM Valve Closed Valve Open |
47 lb. @ 2 7/64" 110 lb. @ 1 3/4" |
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