Firing Order: 1-8-7-2-6-5-4-3
*Note: 1997-Up GM 5.7L LS1, 1988-99 305 and 350 V8 (and some 1987 350 V8) engines, and the 1957-87 262-400 V8 engines, each use different configuration camshaft cores, and cannot be interchanged.
GOOD IDLE WITH INCREASED MID-RANGE AND UPPER RPM TORQUE AND HORSEPOWER. REQUIRES P/N 270-144308-1 VALVE SPRING AND RETAINER KIT. FOR CORVETTE AND CAMARO-FIREBIRD APPLICATIONS WITH AUTO OR MANUAL TRANSMISSION. CYLINDER HEAD MODIFICATIONS AND/OR INCREASE DISPLACEMENT A WORTHWHILE ENHANCEMENT.
| Grind Number: | HR-208/312-2S-13.53 |
| Operating Range: | 1800-5200 RPM |
| Duration Advertised: | 276° Intake / 284° Exhaust |
| Duration @ .050'' Lift: | 208° Intake / 216° Exhaust |
| Valve Lift w/1.7 Rockers: | .530'' Intake / .530'' Exhaust |
| Lobe Separation Angle: | 113° |
| Max Lift Angle: | 108° ATDC Intake / 118° BTDC Exhaust |
| Open/Close @.050'' Cam Lift: | Intake - (4°) ATDC (opens) / 32° ABDC (closes)
Exhaust - 46° BBDC (opens) / (10°) BTDC (closes) |
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