Xtreme 4x4 X4278H Hydraulic Flat Tappet Camshaft
Lift: .564''/.570''
Duration: 278°/288°
Lobe Separation Angle: 111°
RPM Range: 2000-6200


*Note: In order to use these camshafts in 1965-66 396/427ci blocks, it is necessary to machine a 3/16' wide x 7/64' deep groove in the rear main journal of the cam to allow oil flow to the top of the engine.

Good top-end power, needs good intake, headers and gears. Use with 9.5:1 compression and 2500+ stall converter.

Operating Range:	2000-6200 RPM
Duration Advertised:	278° Intake / 288° Exhaust
Duration @ .050' Lift:	234° Intake / 244° Exhaust
Valve Lift w/1.7 Rockers:	.564' Intake / .570' Exhaust
Lobe Separation Angle:	111°

Chevelle, Camaro, Corvette, Stingray, Silverado, C10, Firebird, Chevrolet, Big Block, Chevy, BBC, 454, 427, 502, 396, Caprice, Malibu, Impala, Nova, Monte Carlo, S10, 572


Good top end power, needs good intake, headers and gears. Use with 9.5:1 compression and 2500+ stall.

Emissions Note:

This part is only legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles or on vehicles used solely for the purposes of closed competition racing.

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