604 Circle Track Crate Engine – 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

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604 Circle Track Crate Engine

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

These lightweight aluminum heads include 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.

What’s Included

The IMCA sealed ‘604’ circle track 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.

Important 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 oil pan is 7 inches deep at the sump. It will clear most GM rear-steer chassis with stock engine location
  • For Circle Track Racing only – Not intended for street use
  • Circle Track racing engines from Chevrolet Performance include anti-tampering seals installed
  • Distributor with melonized steel gear MUST be used with long-blocks and Partial engines with steel camshafts, or engine damage will occur.
  • For Circle Track Racing only – NOT intended for street use


19419604, 19433604, 88869604

CT400 604 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 – no link
  • Crankshaft: Forged steel shot peened (P/N 12670965)
  • Connecting Rods: Powdered metal (P/N 10108688)
  • Pistons:: Hypereutectic aluminum (P/N 10159436)
  • Camshaft Type: Steel hydraulic roller (P/N 10185071)
  • Valve Lift (in): .474 intake / .510 exhaust
  • Camshaft Duration (@.050 in): 208° intake / 221° exhaust
  • Cylinder Heads: Fast Burn aluminum; 62cc chambers (P/N 19300955)
  • Valve Size (in): 2.000 intake / 1.550 exhaust
  • Compression Ratio: 9.72:1 Nominal
  • Rocker Arms: Aluminum; roller style (P/N 19210724)
  • Rocker Arm Ratio: 1.5:1
  • Recommended Fuel: Premium Pump
  • Ignition Timing: 36° Total @4,000 rpm
  • Maximum Recommended rpm: 5,800
  • Balanced: External

Dyno Chart


Click here to download installation information.

Chevrolet Performance Crate Engines carry a 24 Month or 50,000 mile warranty (whichever comes first) when installed by a qualified independent service center. Chevrolet Performance Crate Engines also come with a 30 day start up warranty (parts only).

There are some additional limitations on the warranty – please see the official GM warranty documentation for more information.

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