Tri -Y DLM Long Primary 1-7/8 -2 18 Deg

The Tri-Y DLM Long Primary 1-7/8–2 18 Deg header is purpose-built for dirt late model racing applications where maximizing exhaust scavenging and low-to-mid-range torque delivery is critical to competitive performance. Designed for small block Chevy engines, this tri-Y configuration replaces restrictive factory manifolds and single-plane alternatives, allowing independent cylinder runners to merge progressively into a common collector. For racers and engine builders targeting dirt track competition, this header delivers the tuned exhaust dynamics that separate winners from mid-pack finishers on high-banked clay and asphalt circuits.

The tri-Y design utilizes individual 1-7/8 inch primary tubes that step up to 2 inches before converging into a 3.5 inch collector, optimizing pulse scavenging across the RPM range typical of dirt late model racing. The 18-degree bend geometry is engineered to route cleanly around tight engine bay constraints while maintaining optimal tube angles for exhaust flow efficiency. Constructed from steel with black paint for durability and heat management, this header pair includes all gaskets and mounting hardware, eliminating the need for sourcing additional components. The combination of precision mandrel bends and stepped primary sizing ensures minimal turbulence and maximum velocity through the exhaust path, directly translating to measurable horsepower and torque gains on the dyno and track.

Racers and engine builders preparing small block Chevy-powered dirt late models will find this header pair compatible with most modern and classic engine bay layouts, though custom fabrication of downpipes and exhaust systems may be required to mate to existing chassis setups. Installation benefits from included gaskets and fasteners, reducing assembly time at the engine builder's bench. The 21 x 10 x 47 inch footprint and 37.8 lb weight per pair reflect the robust construction necessary for sustained high-RPM racing duty. Whether building a fresh engine for competitive dirt track racing or upgrading an existing competitor vehicle, the Tri-Y DLM Long Primary 1-7/8–2 18 Deg header delivers measurable performance gains and the reliability required for multi-race seasons.