Non Pontiac Motors in Pontiacs includes factory 403,305,350 Chevy, Buick V6,
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Old 05-11-2024, 02:28 PM
Flashflood Flashflood is offline
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Default 403 non stock exhaust headers 77 Lemans

I have 77 Lemans with a 403. I can't seem to find a good answer to a set of aftermarket exhaust. (Headers) that I can run on my car. I had a set of flowtechs no good they just hit the frame. So, without major modifications, I'm back to square one. Does anyone have any ideas. I also saw this set of hookers anyone know if these work? There's also these shorty headers from headman?

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Old 05-17-2024, 04:12 PM
Mr. G Mr. G is offline
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Although I don't have a '77 Lemans, I would think that the shorty headers would be your best bet just due to a reduced overall size which would have less conflicts with other pars of your car. Another idea , although a long shot is see if someone here has a '77 Can Am, some of which came with the 403 and if they have put headers on them successfully.

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