GM 88869604 CT400 IMCA-Sealed 604 Chevy Crate Engine, Dyno Tested

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  • Regular price $7,124.99

350 Chevy Small Block V8, 400 Chevy Small Block V8, 604 GM Chevy Crate Engine
**$175 shipping included in price


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, JF2 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.
  • Dyno-verified horsepower and torque
  • 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


  • 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.


  1. Requires the addition of a carburetor, starter, water pump, distributor, and plug wires (not included). See 121-8604 for a "dressed" version of this engine.
  2. Requires an externally balanced flywheel (not included).
  3. The 8-quart Circle Track oil pan is 7 inches deep at the sump. It will clear most GM rear-steer chassis with the stock engine location.
  4. For Circle Track Racing only - not intended for street use.
Some parts are not legal for use in California or other states with similar laws/regulations