Oldsmobile Small Block Headers
Option for ceramic coating available for additional $175.00 Our very own Thornton design; a direct replacement for an exhaust manifold.These headers are polished 304 stainless steel, with a 1/2" thick steel flange, to prevent warping. Please read the details below to ensure this is the correct purchase for you: -Primary tubes are 1 5/8"-Collector is 3" wide-Exhaust flange is cut to accept a 2 1/4" or 2 1/2" exhaust.-Adapter is needed to fit other sizes. These headers will only fit small block Oldsmobiles with 330, 350, & 403 engines from 1965 to 1976. This excludes1965-1970 B and C's because the steering boxes are rear mounted (towards the fire wall). The Tornados will also have clearence issues. If you can fit factory exhaust manifolds these headers will fit without any modifications. They fit a factory 4 speed manual transmission with clearence to the Z bar. It also mates up to a standard exhaust head pipe measuring 2 1/4" or 2 1/2". They will easily connect to down pipes for a small block Oldsmobile.These will also fit in F-body Trans Ams that have a 403 engine. Please feel free to contact us with any questions!Sold as a pair, with gaskets.

Oldsmobile Small Block Headers

  • Satisfaction guaranteed. All returns and exchanges are accepted within 30 days; no questions asked. The part must meet the following requirements:​

    • Part is unused

    • Part is unaltered

    • Part is in original finish

    • Part to be shipped back with original packaging 

    ​We must be notified about the return so we can ensure a proper return/exchange process. We will send a call tag or return label via email. Shipping charges cannot be refunded, and customer pays return shipping.

    Returns are subject to restocking fees if not returned in original packaging or deemed poorly repackaged. Any and all fees and duties associated with your purchase, are your responsibily.