Run up front with the 400-horsepower CT400 crate engine featuring GM Fast Burn heads! GM Performance Parts' Fast Burn cylinder heads are the fast way to the winner's circle – and they're standard on the 350/400 GM racing engine (often referred to as the "604 crate") from GM Performance Parts. These IMCA-sealed 604 crate engines are based on the popular Fast Burn 385 street crate engine, but include a racing-only 8-quart circle track oil pan with dual kick-out design, along with a valve cover breather kit and special "kool nut" rocker arm design. The assembly also includes an open-plenum high-rise intake manifold and 1.5:1-ratio aluminum roller rockers. The 604 crate engine includes a bulletproof bottom end, anchored by a forged steel crankshaft and hypereutectic pistons. The 23-degree, Fast Burn aluminum heads enable tremendous power in the small-block V-8 because of a unique chamber design that quickly and completely burns all of the air/fuel mixture – giving you maximum power. With the CT400 racing engine under the hood of your Modified or Late Model, you'll put a "fast burn" on the competition. 

-Formerly sold as Chevrolet Performance 88958604

-High-revving matched components -

-A fraction of the price of a custom engine 

-Sealed with IMCA-issued bolts and is approved for use in IMCA -

-Popular in Modified and Late Model classes* 

-400 HP @ 5500 RPM -

-400 ft. lbs. of torque @ 4500 RPM -

-4.00" x 3.48" bore x stroke -

-9.6:1 compression ratio -

-92 octane recommended fuel -

-4-bolt main caps -

-Cam lift: .474" intake / .510" exhaust -

-Cam duration @ .050": 208° intake / 221° exhaust 112° lobe separation -

-1.5:1 ratio aluminum roller rocker arms -

-2.00" Intake / 1.55" Exhaust valves 

Includes: 

Fully assembled long block 

Black steel valve covers w/ breathers 

Oil pump, pick-up, 8 quart oil pan 

Eliminator Vortec intake manifold 

Spark plugs 8" harmonic 

balancer 

Front timing cover 

IMCA-approved seal kit