| Part Number: | 139651 | Grind Number: | HR-306-2S-14 IG |
| Engine Identification: | | | | Start Yr. | End Yr. | Make | Cyl | Description | | 1967 | Up | CHEVROLET | 8 | ROUGH IDLE, PERFORMANCE USAGE, GOOD MID AND UPPER RPM HP, BRACKET RACING, AUTO TRANS W/3500+ CONVERTER, MARINE PERFORMANCE, 3800-4200 CRUISE RPM, FOR 500+ CU. IN. ENGINES, 10.5 TO 12.5 COMPRESSION RATIO ADVISED. BASIC RPM 3800-7000 | | Engine Size | Configuration | | | 396-454 C.I. | V | |
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| Valve Setting: | Intake | .000 | Exhaust | .000 | HOT |
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| Lift: | Intake @Cam | 372 | @Valve | 632 | All Lifts are based
on zero lash and theoretical rocker arm ratios. | | Exhaust @ Cam | 372 | @Valve | 632 | | Rocker Arm Ratio | 1.70 | | |
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| CamTiming: | TAPPET | @.004 | | Lift: | | Opens | Closes | ADV Duration | | Intake | 40.0 BTDC | 86.0 ABDC | 306 | | Exhaust | 94.0 BBDC | 44.0 ATDC | 318 |
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| Spring Requirements: Triple Dual Outer Inner | | Part Number | 99896 | | Loads | Closed | 132 | LBS@ | 1.906 | or | 1 29/32 | | Open | 414 | LBS@ | 1.306 | | |
| | Recommended RPM range with matching components | | Minimum RPM | 3800 | | Maximum RPM | 7200 | | Valve Float | 7200 |
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| CamTiming: | TAPPET | @.050 | | Lift: | | Opens | Closes | Max Lift | Duration | | Intake | 13.0 BTDC | 51.0 ABDC | 109 | 244 | | Exhaust | 67.0 BBDC | 9.0 ATDC | 119 | 256 |
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Bell housings
Air & Fuel