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Canadian Poncho Homepage -> Canadian Poncho -> 58-64 Full Size Power Train Tech Forum -> 2-1/2" Ram Horns Needed
Post Info TOPIC: 2-1/2" Ram Horns Needed
Glenn Musgrave


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Trying to track down a set of 2-1/2" exhaust manifolds to fit my 283.  In case you think I'm crazy, here's why.  I'm getting some work done to it, bored .040"; Melling CCS37 cam; 520 Power Pack heads; 4GC carb.  I was looking for 2" exhaust all the way through, don't want 1-7/8" tail pipes.  Magnaflow currently have a sale on until the end of the week for a stainless steel dual exhaust system but it's 2-1/2" , they don't make it in 2" at any price, so I would need new manifolds or modify the pipe to fit my 2".  The casting numbers I need are 3797942 AND 3797901.  The only place I can find that has them is Classic Industries but I need something cheaper.  Anyone have a set?  Any suggestions, would be much appreciated.  I even called Dorman but they don't have 2-1/2" manifolds, at least the guy I spoke to couldn't find any.



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Prefectca


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https://www.speedwaymotors.com/Corvette-Style-2-1-2-Inch-Ram-Horn-Exhaust-Manifold,9133.html

 

Also found Dorman numbers

left 674-504

right 674-503

 

Paul



-- Edited by Prefectca on Tuesday 27th of October 2020 04:22:05 PM

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694279


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hi i mite have them



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HK1837


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I just bought a repro pair in Australia, cheap as chips here so in North America must be nearly free! The pair I bought had no alternator mount though which is what I wanted.

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seventy2plus2


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Lots of the part #'s you want on ebay, as well as the Dorman #'s. Any local parts store should be able to get the Dorman ones for you.

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Glenn Musgrave


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694279 wrote:

hi i mite have them

 Let me know if you find them, I'm interested.



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694279


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hi will look this week end


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694279


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RE: 2-1/2" Ram Horns Needed
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694279 wrote:

hi i mite have them

 hi  this is what i have .... i know it not what you want



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DonSSDD


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Hed need center dumps for the x frame.

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63 Parisienne sport coupe (The Big GTO), black, maroon interior, 409 4 speed; former owner of a 59 El Camino, 63 Corvette SWC, 62 Chev Bel Air SC.
1963- Pontiac top selling car in Canada

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64PARCONUK


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I just recently received my Magnaflow kit and it is 2" at the headers, opening up to 2 1/2" after one bend and about 10" of 2". I have centre dumps.

Would you like pics?



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Glenn Musgrave


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694279 wrote:
694279 wrote:

hi i mite have them

 hi  this is what i have .... i know it not what you want

 Sorry, but as Don mentioned, I need centre discharge due to the X-frame.  Thanks for the pics, someone else may want them.



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Glenn Musgrave


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64PARCONUK wrote:

I just recently received my Magnaflow kit and it is 2" at the headers, opening up to 2 1/2" after one bend and about 10" of 2". I have centre dumps.

Would you like pics?

 Interesting, you would have thought they would have told me that when I called.  What SKU # did you order? I ordered the exhaust and it is expected to arrive the 3rd week of Nov. 



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4SPEED427


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I have seen that on other factory exhaust pipes for GM as well. Some of the 60's big blocks are like that too, a 2 1/2" pipe but it starts off smaller. 



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Glenn Musgrave


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Interesting Carl, thanks!  64PARCONUK and I seem to have ordered sku 16724, so it looks like I may be able to use my factory rams after all:)  I'll cool my jets until the system arrives in a couple of weeks.



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Glenn Musgrave


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I'd like to thank 64PARCONUK for letting me know Magnaflow's 2.5" exhaust system is 2" at the manifold, saved me quite a few bucks!!!  As you can see in the photo Magnaflow started with 2", then 2.25" and finally 2.5"  Now it's time to clean up the original manifolds and then install new studs.2.5 Exhaust fits 2 Manifold.jpg



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DonSSDD


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Who woulda thunk?

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63 Parisienne sport coupe (The Big GTO), black, maroon interior, 409 4 speed; former owner of a 59 El Camino, 63 Corvette SWC, 62 Chev Bel Air SC.
1963- Pontiac top selling car in Canada

Mahone Bay, NS Still not old enough to need an automatic
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