| Part Number: | 284281 | Grind Number: | H-296-2 (REPLACES CCH-296-2) |
| Engine Identification: | | | | Start Yr. | End Yr. | Make | Cyl | Description | | 1955 | 1981 | PONTIAC | 8 | FAIR IDLE, PERFORMANCE USAGE, GOOD MID-RANGE HP, BRACKET RACING, AUTO TRANS W/3000+ CONVERTER, 3800-4200 CRUISE RPM, 10.0 TO 11.5 COMPRESSION RATIO ADVISED. BASIC RPM 3000-6500 | | Engine Size | Configuration | | | 265-455 C.I. | V | |
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| Valve Setting: | Intake | .000 | Exhaust | .000 | HOT |
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| Lift: | Intake @Cam | 315 | @Valve | 473 | All Lifts are based
on zero lash and theoretical rocker arm ratios. | | Exhaust @ Cam | 325 | @Valve | 488 | | Rocker Arm Ratio | 1.50 | | |
|
| CamTiming: | TAPPET | @.004 | | Lift: | | Opens | Closes | ADV Duration | | Intake | 35 BTDC | 81 ABDC | 296 | | Exhaust | 83 BBDC | 41 ATDC | 304 |
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| Spring Requirements: Triple Dual Outer Inner | | Part Number | 99838 | | Loads | Closed | 110 | LBS@ | 1.688 | or | 1 11/16 | | Open | 312 | LBS@ | 1.228 | | |
| | Recommended RPM range with matching components | | Minimum RPM | 3000 | | Maximum RPM | 6500 | | Valve Float | 6800 |
|
| CamTiming: | TAPPET | @.050 | | Lift: | | Opens | Closes | Max Lift | Duration | | Intake | 10 BTDC | 44 ABDC | 107 | 234 | | Exhaust | 58 BBDC | 4 ATDC | 117 | 242 |
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| Remarks: | | MAINTAIN .040 MIN. BETWEEN ROCKER ARM & RETAINER AFTER VALVE ADJUSTMENT WITH VALVE CLOSED. |
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Bell housings
Air & Fuel