FW: Re: Intake Manifold upgrade for the AMC 6 early - & More Headers

[farna@xxxxxxx]

Forwarded below for Mark, who is having some home e-mail problems. I know for sure the 91-98 exhaust won't work on an Eagle. It likely won't work on a Hornet et. al. either, but if it works on an American it should work on the big AMCs, Javelin, and 69 and older AMCs... except the 58-63 American, which won't mount a 232-4.0L without MAJOR surgery anyway! 

--
Frank Swygert
Publisher, "American Independent 
Magazine" (AIM)
For all AMC enthusiasts
http://farna.home.att.net/AIM.html
(free download available!)
			

-------------- Forwarded Message: --------------
From: "Mark Price" <Mark.Price@xxxxxxxxxxxx>
To: <farna@xxxxxxx>
Subject: Re: Intake Manifold upgrade for the AMC 6 early - & More Headers
Date: Tue, 4 Jan 2005 13:32:40 +0000
> I have the three into two into one 91-98 on mine. I forgot to look and see if I 
> had the pic of the completed modified version. It was severely cracked at the 
> junction of the two into one at the donut area. I cut it all off leaving the two 
> pipes side by side then made a cone and terminated it directly into 2 ½" exhaust 
> tubing. I made an S series of bends down to just below/behind the clutch fork 
> and terminated it with a 2 ½" 3 bolt header flange with a dead soft aluminum 
> gasket. I ran it that way for 1,000 plus miles, works great. I may have been 
> over zealous in the 2 ½" pipe, 2 1/4" may have been better for low end flow, but 
> Oh well, I'm not reworking it now! After reading the posts about cracking, I 
> plan on looking into adding a rear support at the bellhousing.
>   Originally the 2 ½" S bend was clamped on, but when adding the EFI I had it 
> apart and MIG welded it on. I also added an Oxygen sensor bung in the open area 
> after the last two pipes joined.
>    Anyone using a 4.0 would be well served by this type exhaust conversion. 
> Cracked 91-98 manifolds are easy to pick up cheap or free and make an excellent 
> base for this. We talked about this a few years back and questimated 9 
> horsepower gain over an non Ho 87-90 pipe, but that's just a guess, I probably 
> hurt torque with the 2 ½" pipe! But with the light American body and a 5 speed, 
> what do I care!!!!
>   I also have a set of the 99+ cast iron manifolds! I was going to go with dual 
> exhaust just for the WOW factor, but decided the running factor is more 
> important!!!
>    I'm also sure a non modified 91-98 will fit. You will need a custom front 
> pipe though as a Jeep pipe will hang too low. You may be able to modify a Jeep 
> pipe to work. 
>    I'll try and remember the PICS tonight!
>  
> Mark
>  
> Mark E. Price
> Academic Lab Manager
> WVU Creative Arts Center
> PO Box 6111
> Morgantown, WV 26506-6111
>  304-293-4841 ext.3105
> Fax: 304.293.3550
>  
> 
> 
> >>> <farna@xxxxxxx> 1/4/05 8:01:09 AM >>>
> 
> Before I post, let's figure out which one you have! The 87-90 Renix slopes from 
> #1 back to about #5 cylinder, #6 curves forward. The 91-98 is actually a three 
> into two into one design. Looks like you could cut the connector off and have a 
> dual exhaust. 99+ (maybe 2000+) have twin cast iron "headers" like a Volvo. 
> 
> --
> Frank Swygert
> Publisher, "American Independent 
> Magazine" (AIM)
> For all AMC enthusiasts
> http://farna.home.att.net/AIM.html
> (free download available!)
>             
> 
> -------------- Original message ----------------------
> From: "Mark Price" <Mark.Price@xxxxxxxxxxxx>
> > Frank,
> >  I'm at work and having trouble getting my home email up, So post this
> > if you can.
> > I have a "curvy" HO 4.0L exhaust manifold on my now running American. 
> > I custom made the outlet on mine because it was a cracked takeoff and
> > "what the He!!"
> > A non modified one will work though. 
> > A custom downpipe will be needed. 
> > Somewhere at home I think I have a few pictures of the modified piece.
> > I'll look for them if I remember!
> >  
> >  
> >  
> > Mark E. Price
> > Academic Lab Manager
> > WVU Creative Arts Center
> > PO Box 6111
> > Morgantown, WV 26506-6111
> >  304-293-4841 ext.3105
> > Fax: 304.293.3550
> >  
> >  
> 
> 
> 
> 
>