Crossover Headers 1-5/8- 1-3/4 Crate Motor

The Schoenfeld Crossover Headers 1-5/8" to 1-3/4" Crate Motor (model 135VHCM-3) is a purpose-engineered exhaust manifold system designed for small block Chevy crate motor installations and high-performance engine swap applications. These crossover headers feature a conventional crossover design that consolidates exhaust gas flow from both cylinder banks into a single collector, optimizing scavenging efficiency and reducing back pressure in forced-induction and naturally aspirated builds.

Weighing 31.1 lbs with compact overall dimensions of 20.5 x 10 x 37 inches, the 135VHCM-3 headers are engineered to fit tight engine compartments without compromising tube diameter or collector design. The 1-5/8" to 1-3/4" tube taper accommodates the transition between primary runners and secondary flow paths, a critical consideration for builders prioritizing both power delivery across the RPM band and installation clearance in street rod, bracket racing, and vintage restoration platforms. Schoenfeld's manufacturing standards ensure consistency in header tube wall thickness and collector construction, reducing turbulence and improving exhaust scavenging characteristics essential to crate motor performance.

These crossover headers are purpose-built for competitors and enthusiasts transitioning from factory small block manifolds to dedicated performance exhaust systems. Common applications include LS swaps into classic vehicles, carbureted and fuel-injected crate motor builds, and competition vehicles where exhaust scavenging directly impacts power output. Builders evaluating Schoenfeld crossover headers for crate motor duty should confirm collector outlet diameter and downpipe compatibility before ordering to ensure proper integration with their exhaust system plumbing.

Schoenfeld headers are recognized in the engine swap and crate motor community for manufacturing precision and flow-optimized designs. The 135VHCM-3 model represents the standard specification for small block Chevy applications where tube sizing and crossover geometry directly influence dyno results and real-world acceleration characteristics across all performance driving scenarios.