SBC Adapter Kit

The SBC Adapter Kit is a precision-engineered header flange adapter designed for Small Block Chevy engine builds transitioning to Stahl pattern exhaust manifold configurations. Built for serious engine builders, vintage racers, and restoration enthusiasts, this adapter solves a critical compatibility challenge: allowing modern or alternative exhaust systems to bolt directly to classic SBC cylinder heads without expensive welding or custom fabrication. Whether you're upgrading a 355 stroker, converting a vintage race engine, or installing headers on a street machine, this kit eliminates the guesswork and expense of one-off modifications.

Manufactured from aluminum by SCHOENFELD, a trusted name in high-performance exhaust systems, the SBC Adapter Kit features a 0.313-inch thick flange plate with 1.25-inch round port openings that match both standard SBC head ports and Stahl manifold bolt patterns. The aluminum construction keeps thermal mass low while providing the rigidity needed for repeated temperature cycling and vibration exposure common in performance and racing applications. At just 3.2 lbs per pair, the lightweight design minimizes stress on head studs and gasket interfaces, contributing to overall engine bay durability and longevity.

This adapter pair is ideal for engine swaps, vintage drag racing builds, and restorations where original manifold options are unavailable or incompatible with modern cooling and emissions components. Installation requires careful gasket selection and torque sequencing to ensure a leak-free seal; most experienced mechanics complete fitting in under an hour per side. Compatible with all small-block Chevy variants (265–400 cubic inches) that utilize standard cylinder head porting, the SBC Adapter Kit delivers reliable performance across street, strip, and show applications.