
Energizer Hydraulic Flat Tappet Camshaft & Lifter Kit 1955-81 Pontiac 265-455ci - 2800-6200 RPM Range
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- Energizer Hydraulic Flat Tappet Camshaft & Lifter Kit
- 1955-81 Pontiac 265-455ci
- Lift: .480 in./.480 in.
- Duration: 284 deg/284 deg
- RPM Range: 2800-6200
*Note: Cylinder heads with casting number 540306, 544127 or 9771980 were equipped with 1.65 ratio rocker arms, the specs for this camshaft were devise using 1.5 ratio rocker arms.**Note: Ram Air engines require different springs. Minimum .040' clearance required between underside of rocker arms and top of retainers after valve adjustment when valves are closed. Adjustment when valves are closed.
***Note: Since 1975 General Motors divisions have exchanged engines throughout different models (ex. 350ci Chevy engines in Oldsmobile cars). Be certain of exactly which engine you have before ordering.
FAIR IDLE, MODERATE PERFORMANCE USAGE, GOOD MID-RANGE HP, MILD BRACKET RACING, AUTO TRANS W/2500+ CONVERTER, 3400-3800 CRUISE RPM, 9.5 TO 11.0 COMPRESSION RATIO ADVISED.
Grind Number: 284 H12 Operating Range: 2800-6200 RPM Duration Advertised: 284° Intake / 284° Exhaust Duration @ .050' Lift: 228° Intake / 228° Exhaust Valve Lift w/1.5 Rockers: .480' Intake / .480' Exhaust Lobe Separation Angle: 112° Max Lift Angle: 107° ATDC Intake / 117° BTDC Exhaust Open/Close @.050' Cam Lift: Intake - 7° BTDC (opens) / 41° ABDC (closes)
Exhaust - 51° BBDC (opens) / (3°) BTDC (closes)