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Canadian Poncho Homepage -> Canadian Poncho -> 65-70 Full Size Power Train Tech Forum -> 2.5 inch Rams horn exhaust manifolds
Post Info TOPIC: 2.5 inch Rams horn exhaust manifolds
SGS Welding


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2.5 inch Rams horn exhaust manifolds
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Hi guys its me with more ?s

I have been searching for a set of 2.5 inch horns for my car.

so far for the passenger side part # 3797901 or part #3814970 will work  after grinding off the mounting part

these are a straight exit

now the hard part

the closest thing I can come up with for the drivers side is part#3846563 BUT it has a straight dump I think I need an angle dump 

anyone have any experience with this swap?

I heard that some hi power impalas came with factory 2.5 inch ram horns ?

just wondering if that was a better fit than the corvette version?

so far no luck finding one



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CdnGMfan


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Even on the 300-horse 327s the outlets were only 2". As far as I know, only the high performance Corvettes had the larger outlets. Not even the L-79 Chevelles, Beaumonts, Acadians or Chevy IIs had large outlets. There is a solution...

Here is a link you should check out: http://www.castheads.com/log_systems.php. They make both rams horn & log style manifolds with the large outlets. They are far from cheap but it warrants a look.

 

What car are these going onto? I know that Chevrolet was still selling the Corvette rams horn manifolds over the counter a few years back. I don't know if they survived the GM bailout.

 

 Another option is extrude honing. If you find a used set of manifolds that fit but are only 2" outlets, you could get them to flow better by getting them extrude honed. What that entails is running a slurry through them with carbide in the mix. It will smooth out and gradually enlarge the ports as the mix is pumped back & forth through the manifolds while hooked up to the extruder machine.

 



-- Edited by CdnGMfan on Saturday 30th of August 2014 10:19:54 AM

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427carl


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SGS Welding wrote:

Hi guys its me with more ?s

I have been searching for a set of 2.5 inch horns for my car.

so far for the passenger side part # 3797901 or part #3814970 will work  after grinding off the mounting part

these are a straight exit

now the hard part

the closest thing I can come up with for the drivers side is part#3846563 BUT it has a straight dump I think I need an angle dump 

anyone have any experience with this swap?

I heard that some hi power impalas came with factory 2.5 inch ram horns ?

just wondering if that was a better fit than the corvette version?

so far no luck finding one

         I have several manifolds   I will check for a right side "angled"  and let you know  



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SGS Welding


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CndGMfan thanks so much for the info I am looking into the extrusion thing right now! Had no idea that process was out there The car is a 1967 Pontiac Parisienne Carl thanks for offering up some manifolds But I actually have a set of extras I bought at the Barrie flea market a few years back

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rabbit64cs


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Straight down ..speedwaymotors..have a look.

image.jpg

 

image.jpg

 



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later...rog

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cdnpont


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Good website,



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Magician40


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I have 2 1/2in. on my stock 327, 300hp 64cs. I thought these were stock on these engines.
Brian

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4SPEED427


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Yes, you are correct I am sure. I've seen both 63 and 64 300 hp 327 Impalas in wrecking yards with 2 1/2 inch rams horn manifolds.

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SGS Welding


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So does  the left side have an angled outlet? 



-- Edited by SGS Welding on Wednesday 3rd of September 2014 07:42:01 PM

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427carl


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Carl Stevenson wrote:

Yes, you are correct I am sure. I've seen both 63 and 64 300 hp 327 Impalas in wrecking yards with 2 1/2 inch rams horn manifolds.

        heres some info from Chevy guys  

 

http://www.chevytalk.org/fusionbb/showtopic.php?tid/297787/



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SGS Welding


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Thanks Carl for the link.Looks like a mill job and some extreme pipe bends will do the trick.

I wish Chevy or the aftermarket would have made one! 



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BigDogSS


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Hi All,

  I've just installed the 2.5" Ram horn manifolds on my 1967 Impala SS.  It is going to the exhaust shop tomorrow.  I will let you know how it goes.



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    1967 Chevrolet Impala SS 396 - Marina Blue FF
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ARCADIAN


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I have the 2.5 fuelie ram horns on my Acadian and had them cramic coated. Cheaper than headers.

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BigDogSS


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OK, I got the exhaust installed!!  it fits, but just barely.  

IMG_1136[1].JPG



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    1967 Chevrolet Impala SS convertible - Ermine White C1
    1967 Chevrolet Impala SS 396 - Marina Blue FF
    1996 Chevrolet Caprice Classic LT1
    2001 Ford F250 CC 4x4
bjburnout


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SGS Welding wrote:

So does  the left side have an angled outlet? 



-- Edited by SGS Welding on Wednesday 3rd of September 2014 07:42:01 PM

 ........are these of any help..........

 

http://canadianponcho.activeboard.com/t59449003/1965-327-exhaust-manifolds-reduced/



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