Chevrolet Performance 604 Circle Track Crate Engine


  • 404 hp @ 5,600 rpm/406 lb.-ft. @ 4,600 rpm
  • Circle Track Limited Late Model “GM 604” Engine
  • For Circle Track Racing – NOT intended for street use
  • Comes with GM anti-tamper and IMCA seals installed
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.

SKU: 19370604 Categories: , Tag:

CT400 Sealed ‘GM 604’ Racing Crate Engine

P/N 19370604

404 hp @ 5,600 rpm / 406 lb.-ft. @ 4,600 rpm

Circle Track 400 (CT400) Tech Specs:
Engine Type: Chevy Small-Block V-8
Displacement (cu in): 350
Bore x Stroke (in): 4.000 x 3.480
Block (10243870): Cast-iron with 4-bolt main caps
Crankshaft (12670965): Forged steel shot peened
Connecting Rods (P/N 10108688): Powdered metal
Pistons (P/N 10159436): Hypereutectic aluminum
Camshaft Type (P/N 10185071): Steel hydraulic roller
Valve Lift (in): .474 intake / .510 exhaust
Camshaft Duration (@.050 in): 208° intake / 221° exhaust
Cylinder Heads (P/N 19300955): Fast Burn aluminum; 62cc chambers
Valve Size (in): 2.000 intake / 1.550 exhaust
Compression Ratio: 9.72:1 Nominal
Rocker Arms (P/N 19210724): Aluminum; roller style
Rocker Arm Ratio: 1.5:1
Recommended Fuel: Premium Pump
Ignition Timing: 36° Total @4,000 rpm
Maximum Recommended rpm: 5,800
Balanced: External

Installation Notes:

  • Requires addition of carburetor, starter, ignition, plug wires, water pump, distributor and exhaust system (not included)
  • Requires an externally balanced flywheel (not included)
  • The 8-quart Circle Track “Late-Model” (P/N 25534354) oil pan is 7 inches deep at the sump and will clear most GM rear-steer chassis with stock engine location
  • For Circle Track Racing only – NOT intended for street use

Note: Distributor NOT included (P/N 88961867 recommended) with CT400 engine. MUST use melonized steel gear (P/N 10456413) on engines with steel camshafts, or engine damage will occur.

Supersedes P/N 19318604, 88869604




CT400 Sealed ‘604’ Racing Crate Engine

88869604 Chevrolet Motor

High-Revving Performance and Durability

The Chevrolet Performance CT400 racing crate engine is fully sealed for IMCA “A-Mod/Modified” use and now features new cylinder head assemblies with LS-style beehive valve springs that enable greater high-rpm performance and durability.

Those lightweight aluminum heads are based on the proven Fast Burn head design, with large intake runners and 2.00/1.55-inch valves. The CT400 also has a tough bottom end, with a forged steel crankshaft and strong aluminum pistons circulating in a new four-bolt main block.

The IMCA sealed ‘604’ crate engine assembly also includes an open-plenum high-rise intake manifold, a racing-only 8-quart circle track oil pan with a dual kick-out design, a valve cover breather kit and aluminum roller rocker arms.

For Circle Track Racing only ? NOT intended for street use

Dyno Chart

Click here to download installation information.

Chevrolet Performance Racing Crate Engines are excluded from limited warranty.