Oldsmobile Big Block Headers

Thornton design; a direct replacement for an exhaust manifold.

Our 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 big block Oldsmobiles with 455, 425, & 400 engines from 1965 to 1976. This excludes 1965-1970 B&C's because the steering boxes are rear mounted (towards the fire wall). 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 big block Oldsmobile.


Please feel free to contact us with any questions!

Sold as a pair, with gaskets.


Oldsmobile Big Block Headers


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