CT400 Crate Engine – Chevy Performance 604 Sealed Crate Engine Dyno Tested (D1)


  • Dyno-verified Horsepower and Torque
  • Engine is Race-Ready
  • Camshaft and Piston Rings are Broken-In
  • Dyno report For Your Engine
  • Replaces 19370604, 88869604, 19318604, 19419604
Due to world events we are working with our manufacturers every day to ship and receive parts. If the part you are looking for is time sensitive please give our team a call at 855-806-1147 before ordering to ensure it's availability.

Shipping is free, but there is a delivery fee for residential addresses.

CT400 604 Crate Engine

Run ahead of the pack with the 400-horsepower CT400 crate engine (often referred to as the”604″). Based on the popular Fast Burn 385 street crate engine, these 604 Chevy IMCA-sealed racing engines include 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. The Fast Burn heads have a unique chamber design that helps completely burn all of the air/fuel mixture.

Now, Karl Kustoms is offering this 604 crate engine as a dyno-verified package that is ready to race. With this engine under the hood of your Modified or Late Model, you’ll put a “fast burn” on the competition! (Read more about dyno testing on the Karl Kustoms blog here.)

Note: This item is made to order. It will be shipped from our warehouse when it is produced.

What’s Included

  • Fully assembled long block
  • Black steel valve covers with valve cover breather kit
  • Oil pump, pick-up, 8-quart circle track oil pan with a dual kick-out design
  • Eliminator Vortec intake manifold
  • Spark plugs
  • 8″ harmonic balancer
  • Front timing cover
  • Dyno sheet of your engine
  • IMCA-issued seals are installed

The Fast Burn Design includes:

  • Proven lightweight aluminum cylinder head assemblies with large intake runners
  • 2.00/1.55-inch valves, and strong aluminum pistons
  • A brand-new block with four-bolt mains and a forged steel crankshaft
  • An open-plenum high-rise intake manifold
  • A racing-only 8-quart circle track oil pan with a dual kick-out design
  • Valve cover breather kit and special “kool nut” rocker arm design
  • Aluminum roller rocker arms.

Important Notes

  • Requires the addition of a carburetor, starter, water pump, distributor and plug wires (not included). See 19419604D2 for “dressed” version of this engine.
  • Requires an externally balanced flywheel (not included).
  • 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.
  • For Circle Track Racing only – not intended for street use.
  • This item is made to order. It will be shipped from our warehouse when it is produced.
  • Broke-in, dyno-verified HP/TQ, and IMCA-sealed for competition.
  • Some parts are not legal for use in California or other states with similar laws/regulations.
  • Dyno-verified horsepower and torque
  • Piston rings are broken-in using our SuperFlow dyno system
  • 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*

*Check track/series rules for approval qualifications.



19419604D1, 19433604D1

CT400 604 Chevy Sealed Crate Tech Specs

  • Engine Type: Chevy Small-Block V-8
  • P/N: 19419604D1
  • Power: 400 hp @ 5,500 rpm / 400 lb.-ft. @ 4,500 rpm
  • Displacement (cu in): 350 cu. in.
  • Bore x Stroke (in): 4.00″ x 3.48″
  • Block: Cast iron with 4-bolt main caps
  • Crankshaft: Forged 4340 steel
  • Connecting Rods: Powdered metal
  • Pistons: Hypereutectic aluminum
  • Intake Manifold: Single-plane aluminum
  • Camshaft Type: Hydraulic roller tappet
  • Valve Lift (in): .474 intake / .510 exhaust
  • Camshaft Duration (@.050 in): 208 intake / 221° exhaust
  • Cylinder Heads: Fast Burn aluminum
  • Valve Size (in): 2.000 intake / 1.550 exhaust
  • Compression Ratio: 9.6:1
  • Rocker Arms: Aluminum roller style
  • Rocker Arm Ratio: 1.5:1
  • Recommended Fuel: 92 octane recommended fuel
  • Ignition Timing: 36° Total at 4,000 rpm
  • Maximum Recommended rpm: 5,800
  • Balanced: External


Click here to download installation information.

Chevrolet Performance Racing Crate Engines are excluded from limited warranty.


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Prop65WARNING: These auto parts can expose you to chemicals including phthalates and lead. Installing or using these parts can expose you to other parts containing these chemicals and to engine exhaust, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to