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Post Info TOPIC: 75 455 exhaust manifolds


Addicted!

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Posts: 220
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75 455 exhaust manifolds


the standard Pontiac cast "log" manifold actually flows better than many people might think - the same units were used on non-Ram Air GTO's that made 350hp.

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1970 Formula 400
Carousel Red on black (std) interior
350hp, Hurst shifted Muncie 3 speed, steel wheels w/poverty caps
1:411 1970 Firebird Formulas originally sold in Canada

Luke 23: 39-43 / Ephesians 2: 8-9  / 1 Corinthians 2:12-14 / 2 Timothy 3:1-5;12



Poncho Master!

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Posts: 2021
Date:

were they all 2 in or were some 21/2 on the exit, my concern is that it is 455 , I would figure larger would be just common sense.



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Poncho Master!

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Unfortunately not, the biggest you could get with the log exhaust manifolds outlet was 2 1/4 ".



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Poncho Master!

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Posts: 2021
Date:

that's why I was thinking going to the 21/2 inch repro, plus when every bolt breaks in the head and I have to lift the motor up to change gaskets then its a perfect time to update it.



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Veteran Member

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Posts: 70
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As usual Ray is bang on with the way exhaust was set up for 75 and 76. It was even that way on police interceptors which serious hampered their performance. Getting back to the exhaust manifold questions: I remember driving a 1973 Laurentian with the 455 interceptor. The clearance was super tight for the exhaust manifolds, combine that with an engine that had a tremendous amount of torque and you had a recipe for cracking manifolds. If you kicked it down and it jumped back in 1st the manifold was done.

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