Knoxville Pro Sprint Class CT525 Circle Track Sealed Crate Engine

A sealed CT525 6.2-liter circle track crate engine carrying approval to run in Knoxville Raceway's Pro Sprint Class, upgraded over the base build with forged aluminum pistons added for durability under sustained high-rpm racing.

What this engine is

Based on the LS engine family GM introduced in 1997 and reworked for oval-track use, this cast aluminum long block combines a single-plane carbureted intake, a camshaft ground for high lift, and a 6-quart oil pan sized for racing with rectangular-port LS3-style cylinder heads carrying 68cc chambers. Output is rated at 533 horsepower and 477 lb-ft of torque, delivered through a single-plane intake manifold.

What "sealed" means for this class

Anti-tampering seals go on at the factory, and the approval on this particular build is specific to Knoxville's Pro Sprint Class, so check your own track or series rulebook to confirm eligibility before ordering rather than assuming any sealed LS crate qualifies. As is standard for a race-only crate engine like this, it is sold without a manufacturer warranty, since it is not intended for street use or everyday driving.

Common questions

Is this legal for street use? No, it is built and sealed for sanctioned circle track racing.

Does it carry a warranty? No, race engines of this type are sold without one.

What horsepower and torque does it make? 533 horsepower and 477 lb-ft of torque.