SKU: SCH1105
MPN: 1105
The Schoenfeld 1105 is a one-piece, 4-1 circle track header built for small block Chevy modified racers who want strong mid-range pull off the corner. The mid-length primary design favors the part of the powerband where dirt and asphalt modified cars actually spend their time, rather than chasing peak numbers up top. These fit a wide range of chassis builds, so racers running purpose-built tube cars will recognize the layout. If you're working through a full exhaust build, our small block Chevy header lineup gives you several primary and collector combinations to compare against this one.
Construction is steel, with 1 5/8 in. primary tubes feeding a single 3 in. collector per side in the 4-1 configuration. The flanges run a standard style at 0.25 in. thickness, which gives you a solid sealing surface that resists warping under repeated heat cycles. Each pair ships with the bolts, studs, and gaskets needed to bolt them up, so you're not sourcing hardware separately. Schoenfeld finishes these in a temporary, non-high-temperature paint, meaning the coating is there for shipping and shelf life, not durability. Plan to coat or wrap them before running hard. Built in Van Buren, Arkansas, these are a known quantity among modified racers who want a header that flows without exotic step designs.
These are racing and off-road parts, not legal for street use on 1975-and-later model year vehicles. They belong on a dedicated modified car running circle track ovals where mid-range power matters more than top-end horsepower. Once they're mounted, most racers pair them with a tech-legal canister to meet sanctioning rules, so it's worth looking at our spec muffler options and adding header wrap and heat protection to manage cockpit temps. For broader fitment questions across builds, browse the full headers category to match flange and collector dimensions to your chassis.
Per manufacturer specifications, the Schoenfeld 1105 runs 1 5/8 in. primary tubes feeding a 3 in. collector in a 4-1 one-piece configuration. That combination is aimed at building strong mid-range power for modified circle track cars rather than maximizing top-end output.
No. These are racing and off-road parts and are not legal for street use on 1975-and-later model year vehicles. They are intended for dedicated race cars running sanctioned circle track and off-road applications only.
Yes. Each pair includes the bolts, studs, and gaskets needed to bolt them to the heads, so you can mount them without sourcing separate hardware. They are sold as a pair.
No. Schoenfeld applies a temporary, non-high-temperature paint for shipping and shelf life only. It will not survive running heat, so plan to coat or wrap the headers before putting them into service.
These fit a range of modified chassis builds, including Dirtworks, Harris, Hoffman, Jet Racing, and Larry Shaw cars. Confirm flange pattern and collector clearance against your specific chassis before ordering.
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