When the 2024 Unlimited Off-Road Racing schedule kicked off with the Parker 400, Justin Davis entered the Unlimited Truck SPEC class with a brand-new TSCO chassis. His first race in the truck resulted in a victory at the Arizona venue.

After Davis’s win in the Parker 400, he received a new Chevrolet Performance 525 RLB crate engine from AutoNation Chevrolet Gilbert. It is a sealed long-block assembly based on Chevrolet Performance’s CT525 circle track crate engine.

When he began racing, Justin Davis spent most of his time in Unlimited Buggies. Along the way he became a five-time winner of the prestigious Baja 1000, competing in the event for the first time at age 16. He has since scored a wide variety of other wins, including the Baja 500 twice. Davis is also a two-time SCORE points champion.

The 525 RLB crate engine is capable of 533 horsepower and 477 lb.-ft. of torque. Details include an SFI-certified balancer, a six-quart racing oil pan and more. It is delivered without induction or ignition systems, which must be sourced and installed separately.

Davis won the Parker 400 with an engine based on the Chevrolet Performance LS376/525 crate engine. It is a popular choice in spec classes and is based on the LS3 6.2L engine, but with the racing-developed ASA camshaft that helps push output to 525 horsepower.

The 525 RLB is designed to save costs by incorporating a variety of high-strength parts that spec-class racers and builders were already using. The factory-sealed engine also helps keep competitors on a level playing field and simplifies the inspection process for technical officials.