Chevrolet Performance IMCA-Seal 604 Crate Engine, Dyno Tested

Run up front with the 400-horsepower CT400 crate engine (often referred to as the "604 crate") featuring Fast Burn heads from GM Performance Parts. Now, Speedway Motors Racing Engines is offering this 604 crate engine as a dyno-verified package that is ready to race!

These IMCA-sealed 604 crate racing 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.

• IMCA sealed and approved for use in IMCA
• Dyno-verified horsepower and torque and will include a dyno sheet of your engine
• 400 HP @ 5500 RPM 400 ft. lbs. of torque @ 4500 RPM
• Piston rings are broken-in using a proprietary dyno program to ensure proper ring seal which increases horsepower
• Lifter preload and timing are set prior to break in procedure for race ready performance right out of the crate
• Piston rings are broken-in using a proprietary dyno program
• Lash and timing are individually tuned
• Engine is ready to race, right out of the crate
• IMCA-sealed for equal competition
• 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
• Dyno sheet of your engine
• IMCA-issued bolts and is approved for use in IMCA

*Check track/series rules for approved applications.

Spec Sheet (PDF)