Small Block Chevy 1981-87
*Note: 50-State Legal. This camshaft has been granted a California Air Resources Board (CARB) exemption (an ''EO'' number), or is a direct or consolidated replacement part. It is 50-state legal, per the manufacturer's application guide.
**Note: For 1981-87 cars only.
***Note: In order to use these camshafts in 1955-57 265ci blocks, it is necessary to machine a small groove in the rear main journal of the cam to allow oil flow to the top of the engine.
****Note: Beginning in 1987, most of the V-6 and V-8 engines were equipped with hydraulic roller camshafts. There are differences in the block to accommodate a cam retention thrust plate and the anti-rotation mechanism for the lifters. These blocks are identifiable by bolt holes for a cam retention plate under the upper timing sprocket, as well as bosses and tapped holes in the lifter valley for lifter retention hardware. The camshafts on these engines have a step nose and smaller bolt circle on the front of the cam. An earlier model camshaft may be used in these blocks by using the appropriate timing chain set and adding a thrust button when using a roller cam.
1988-99 Chevrolet 305 and 350 V-8 engines (and some 1987 350 V-8 engines) use a different configuration camshaft core than the 1955-87 engines and cannot be interchanged.
GREAT FOR 305 H.O., PERFORMANCE 350 TRUCKS AND TPI-EQUIPPED 350 ENGINES. GOOD MID- AND TOP-END TORQUE AND HP. AXLE RATIOS OF 3.73 OR NUMERICALLY HIGHER REQUIRED. AUTO OR 5- SPEED MANUAL. MUST USE ADJUSTABLE FUEL PRESSURE REGULATOR. (50 STATE LEGAL IN 1981-87 267-400, CARB EQUIPPED CARS ONLY. C.A.R.B. E.O. D-225-25)
|Operating Range:||1600-5000 RPM|
|Duration Advertised:||270° Intake / 276° Exhaust|
|Duration @ .050'' Lift:||210° Intake / 216° Exhaust|
|Valve Lift w/1.5 Rockers:||.440'' Intake / .454'' Exhaust|
|Lobe Separation Angle:||114°|
|Max Lift Angle:||109° ATDC Intake / 119° BTDC Exhaust|
|Open/Close @.050'' Cam Lift:||Intake - (4°) ATDC (opens) / 34° ABDC (opens)|
Exhaust - 47° BBDC (opens) / (11°) BTDC (closes)
The most popular OE camshaft type through the late 1980s, hydraulic lifter profiles can provide a power curve that tops out just over 7000 RPM when used with high-performance hydraulic lifters. Also easy to maintain, hydraulic cams range from aggressive (rough idle) to towing (improved bottom-end torque).
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