CT400 IMCA-Sealed 604 Crate Engine, Dyno Tested, Dressed

Dressed and dyno-verified, this "604 crate" is finished with an MSD Pro-Billet distributor already installed and timed, ready for competition. Chevrolet's underlying small-block architecture here is good for 400 horsepower at 5,500 rpm, with 400 lb-ft of torque arriving at 4,500 rpm.

What arrives bolted on

Black steel valve covers with breathers, an open-plenum, high-rise intake manifold, Moroso Ultra 40 spark plug wires, spark plugs, an 8-inch harmonic balancer, a front timing cover, and a fuel pump block-off plate round out this dressed package, along with an 8-quart circle track oil pan featuring a dual kick-out design.

Why the dyno step matters

Piston rings go through a proprietary dyno break-in program before this engine ships, with lash and timing individually tuned rather than set at a generic factory spec, so it is race-ready the moment it arrives. On the bottom end, a 4.00-inch bore pairs with a 3.48-inch stroke, while the valves, 2.00 inches on the intake side and 1.55 on the exhaust, work through roller rockers geared 1.5 to 1, spaced across a 112-degree lobe separation. A carburetor, starter, and water pump are not included, and this build calls for an externally balanced flywheel.

Q: Is the distributor already installed and timed? Yes, an MSD Pro-Billet distributor ships installed and timed on this dressed package, ready to fire once fuel and exhaust are sorted.