XE47 250/256 HFTBBC

Featuring a quicker valve opening, the Xtreme Energy camshaft profile provides increased responsiveness and more area under the lift curve than older, slower grinds. Designed to increase performance without sacrificing driveability and creature comforts, the Xtreme Energy grind family offers gains in torque and horsepower while still delivering adequate vacuum for power brakes and other vacuum dependent accessories. Xtreme Energy camshafts work great in carbureted applications, but offer the best performance with aftermarket intake manifolds, lower gear ratios, headers and free flowing exhaust.

Additional Information

Pro Street/bracket, needs good intake, headers, gear and 3200+ stall.

Application Summary

Chevrolet GEN IV 396-454 Big Block Engines Originally Equipped with Flat Tappet Camshafts

Part Type

Engine Camshaft

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Product Details

Product Downloads

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1.	Catalog

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Reference Information

Camshaft, Hydraulic Flat Tappet, Duration 294 Int./306 Exh., Lift 0.588 Int./0.593 Exh., Lobe Separation 110, Chevy, BBC, 396-454, Each

Smart engine builders understand the benefits of a 4&7 firing order swap camshaft, which exchanges the 4 and 7 camshaft lobe timing in small and big block Chevy engines. While some builders have realized significant horsepower gains, all of them experience the exceptionally smooth torque curve possible with this new firing order technology. Dyno, Spintron, and track-tested, these camshafts do not require any engine block, ignition, or valvetrain modifications and can be custom-ground to the engine builder's exact specifications. Regardless of the cam specs that you require, these camshafts are engineered to achieve the maximum power possible using advanced lobe designs.