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1955 Dual Exhaust....Can it Be done

 
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chieftain55



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PostPosted: Mon Dec 04, 2017 1:11 am    Post subject: 1955 Dual Exhaust....Can it Be done Reply with quote

I recently purchased a 1955 Pontiac Wagon. It has the 200 HP engine in it. It runs great but I really would like to put dual exhaust on it. If I purchase the exhaust Elbow "L" used on 56 models to run dual exhaust will it fit my 55 exhaust manifold? I see that the manifolds themselves have different part numbers so I am not sure if the "L" will fit. Any help and insight would be greatly appreciated.
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Larry
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PostPosted: Mon Dec 04, 2017 10:38 pm    Post subject: Exhaust Manifolds Reply with quote

I know you're thinking about only getting the elbow, but here's some additional info.

Wallace racing shows this under "Exhaust Manifolds" in their interchange chart: 1955, 1956, 1957, 1958, 1959-1979 (D-port) 1968-1974 (Round port).

This is from the PontiacSafari web site: Exhaust manifolds interchange between 1955 through 1960 and later. That means any year exhaust manifold will bolt up to any year heads. However you must be aware of other issues such as will the manifold fit in the chassis, are the exhaust port sizes compatible and will the header pipes fit the manifold. Early heads/manifolds used smaller ports than later heads/manifolds.

Shown below is '56 exhaust manifold with elbow used for dual exhaust. It appears the manifolds are (or at least look) the same, except the '56 has a 1/4 bigger outlet. Does this manifold look like yours? Do you have room for the elbow?

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