Fits Tight Builds & Classics – Center-dump shorty headers for Gen 1 Small Block Chevy 265–400 V8 engines. Designed for 1923–1949 street rods, 1955–1957 Chevy full-size (Bel Air, 210, Nomad), and 1955–1959 Chevy/GMC trucks with front engine mounts or compatible custom mounts. Will Not Fit Later Mount Styles – Not compatible with GM side mounts (1958–1972), or any year of GM clamshell style mounts. Will not fit vehicles where the collector conflicts with factory frame brackets. Not Listed for Vehicles Manufactured After 1959 – These headers are designed around early hot rod and pre-1960 vehicle configurations. Black Aluminized Thermal Barrier Coating – Durable steel headers with heat- and corrosion-resistant coating. Includes upgraded copper gaskets, hardware, and 3-bolt collectors. Check Your Build Before Ordering – Will not fit angle-plug heads. These will interfere with steering boxes beside the collector (Nova, G-body) and crossmembers under center ports. Flexible dipsticks and short oil filters recommended. Certified Automotive Experts Black Aluminized Thermal Barrier Coated Block Hugger Headers – Gen 1 Small Block Chevy SBC 265–400 V8 Built for tight-clearance installations and classic hot rod builds, these center-dump block hugger headers are purpose-engineered for Gen 1 SBC 265 283 302 305 327 350 400 engines in vehicles manufactured through 1959. Designed to tuck tightly against the block and sit above the frame rails, they are ideal for traditional hot rods, Tri-Five Chevys (1955–1957), early Chevy/GMC trucks (1955–1959), and other pre-1960 applications with front engine mounts. Constructed from heavy-duty steel with a black aluminized thermal barrier coating, these headers provide excellent heat resistance, corrosion protection, and long-lasting durability. The set includes upgraded copper/fiber gaskets, 3-bolt collectors, and mounting hardware for a secure installation. Compatible Applications: 1923–1949 street rods with SBC swaps 1955–1957 Chevrolet full-size cars (Bel Air, 210, Nomad) with front engine mounts 1955–1959 Chevy/GMC trucks (Task Force series) 1959 and older kit cars or custom builds with front or custom mounts Not Compatible With: GM side-mount engines (1958 and newer) Any Year GM clamshell-style mounts Vehicles manufactured after 1959 Angle-plug cylinder heads Frames with crossmembers under center exhaust ports Vehicles with steering boxes directly beside the collector Technical Specifications: Style: Center-dump shorty block hugger headers Primary Tubes: 1-5/8" Collectors: 2-1/2" inlet / 2" outlet, 3-bolt design Flanges: 3/8" thick Material/Finish: Steel with black aluminized thermal barrier coating Includes upgraded copper/fiber gaskets, collectors, and hardware Important Note: These headers are not listed for use on vehicles manufactured after 1959. They are dimensionally specific to pre-1960 installations.