COMP Cams CL12-305-3 Pure Energy 246H Hydraulic Flat Tappet Cam and Lifter Kit

The COMP Cams CL12-305-3 Pure Energy 246H is a hydraulic flat tappet camshaft and lifter kit engineered for Chevrolet Gen I Small Block engines. Designed as a 50-state emissions-legal performance upgrade for 1987 and earlier carbureted V8 applications, this kit delivers mild but real power gains over the factory camshaft while retaining compatibility with stock engine components—making it an ideal choice for daily-driven street vehicles.

COMP Cams' Pure Energy series is purpose-built to work with factory stock components right out of the box. With an operating RPM range of 1,200 to 5,200 RPM, this grind prioritizes low-end torque, throttle response, and smooth drivability over peak power. It offers a valve lift of .429" intake / .438" exhaust, with an advertised duration of 246° intake / 263° exhaust and a lobe separation angle of 110°.

Kit Includes:

• Hydraulic flat tappet camshaft
• 16 hydraulic flat tappet lifters
• Assembly lube
• Decals and instructions

Camshaft Specifications:

• Cam Type: Hydraulic Flat Tappet
• Advertised Duration: 246° Intake / 263° Exhaust
• Valve Lift (w/ 1.5:1 Rockers): .429" Intake / .438" Exhaust
• Lobe Separation Angle: 110°
• Operating RPM Range: 1,200–5,200 RPM

Important Fitment Notes:

• Fits Chevrolet Gen I Small Block engines: 262, 265, 267, 283, 302, 305, 307, 327, 350, and 400 c.i.d.
• Does not fit LT1, LT4, or factory roller cam Small Blocks built from 1985 and newer
• Does not fit LS-based engines (LS1, LS2, LS3, 4.8, 5.3, 5.7, 6.0, 6.2)
• GM began transitioning to roller camshafts in the mid-1980s; remove the intake manifold or timing cover to confirm flat tappet compatibility before ordering
• 1955–1957 Chevrolet 265 engines require a groove on the 5th cam journal for proper oiling

The CL12-305-3 is a straightforward bolt-in upgrade for any street-driven Gen I Small Block Chevy owner looking for improved response and power over stock, without sacrificing emissions compliance or daily driveability.