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Pontiac of the Month

360Rocket's 1970 GTO

2019 March
of the Month

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Mark

Ram air manifold

Question

I have fire bird ram air exhaust manifolds due to the oval port edelbrock heads.  They have 3" outlets. The muffler shop just put a flare on the exhaust pipes with no gasket.  I expected something like a flange gasket.  Of course I eventually had leakage, ground the manifold outlet for a tighter fit.  

Recent modification to the car and putting a new exhaust on it.  Any suggestions for sealing these tighter?

 

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Pictures help in situations like this. That said, are your exhaust manifolds reproductions or factory originals? I would also expected an exhaust gasket.

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Can't find long tube headers for my catalina, anyone know of what might fit, I have oval ports.  I might just try a firebird set, see how it goes. 

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I might try a set of Ram Air Restorations HO Exhaust manifolds.

https://www.ramairrestoration.com/rm-2-os-ram-air-style-factory-headers-oversized.html

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I have those, would really like long tube headers 

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As you already know, most of the major header manufacturers don't stock a header, much less a long tube header, for a 1970 Catalina. All the love goes to the A-body and F-body cars in that year. You have a few, less than ideal choice:

1. Continue with the HO manifolds you have

2. Buy a universal kit and build a set of your own custom one-off headers (or find someone to cut and weld them up for you)

3. Call one of the larger header manufacturers and see if they will make you a custom set (a.k.a special order). They probably made them back in the day but there is no demand for them today.

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