Product Summary

604, Deluxe Crate Engine Crate Engine Type

  • Dressed version includes distributor, distributor clamp, spark plug wires, and fuel pump block off plate in addition to the GM supplied crate engine
  • IMCA sealed and approved for use in IMCA
  • Dyno-verified horsepower and torque and will include a dyno sheet of your engine
  • 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

Key Specs

Crate Engine TypeDeluxe Crate Engine
Engine Displacement350 cu. in.
Horsepower400 horsepower
Compression Ratio9.6:1
Torque400 ft./lbs.

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Speedway Motors Racing Engines 88869604 Details

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 dressed & 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
  • MSD Pro-Billet distributor is installed & timed
  • 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
  • MSD Pro-Billet85501distributor
  • Moroso Ultra 40 spark plug wires, black, under-header (terminals installed)
  • Spark plugs
  • 8" harmonic balancer
  • Front timing cover
  • Fuel pump block-off plate
  • Dyno sheet of your engine
  • IMCA-issued bolts and is approved for use in IMCA

*Check track/series rules for approved applications.


CARB Warning

For race/ off road use only

Emissions warning: this part only legal for sale or use in California for racing (competition) vehicles which may never be used, registered, or licensed for use upon a public highway. Any other use renders the vehicle tampered and not legal for use on California public highways (any public street or roadway, public dirt road, public park, or publicly maintained right of way open to the use of the public for vehicular travel). Violations subject to $37,500 penalty per violation per vehicle, revocation of registration, loss of use on California public right of ways, and proof of correction for tampering. There are similar restrictions and penalties under federal law and the laws of all other states with penalties under federal law of up to approximately $45,268 per tampered vehicle and/or engine.

Speedway Motors Racing Engines 88869604 Specifications

MFG. Part #88869604
BrandSpeedway Motors Racing Engines
Crate Engine TypeDeluxe Crate Engine
Engine Displacement350 cu. in.
Horsepower400 horsepower
Compression Ratio9.6:1
Torque400 ft./lbs.
Camshaft TypeHydraulic Roller Tappet
Cylinder Head MaterialAluminum
Piston MaterialHypereutectic Aluminum
Crankshaft MaterialForged 4340 Steel
Camshaft Duration (.050 in)208° intake / 221° exhaust
Camshaft Lift (in).474 intake / .510 exhaust
Bore x Stroke (in)4.000" x 3.480"
Carburetor IncludedNo
Intake Manifold IncludedYes
Distributor IncludedYes
Connecting Rod MaterialPowdered Metal
Valve Covers IncludedYes
Cylinder Heads IncludedYes
Rear Main Seal Style1-piece
Oil Pan IncludedYes
Timing Cover IncludedYes
Water Pump IncludedNo
Harmonic Balancer IncludedYes
Flexplate IncludedNo
Flywheel IncludedNo
Air Cleaner IncludedNo
Spark Plugs IncludedYes
Spark Plug Wires IncludedYes
Maximum RPM5800
CNC-Machined Combustion ChamberNo
Intake StyleSingle Plane
Camshaft IncludedYes
CNC-Machined RunnersNo
NotesBroke-in, dyno-verified HP/TQ, and IMCA-sealed for competition. Includes distributor (installed & timed) and fitted spark plug wires.
Sold in QuantityEach