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

[farna@xxxxxxx]

It is DEFINITELY the 87-90 that will only fit in an Eagle, and I suspect other AMC cars. On the Eagle the engine mount is in the way, and it's in the same place as other AMC cars. The 87-90 tubular exhaust is better flowing than the stock manifolds, consider it the six cylinder equivalent of the V-8 factory "free flow" exhaust manifolds. 

The 87-90 4.0L exhaust is prone to cracking around the last three tubes. This is due to the weight of the exhaust system. When I had mine welded I had the cracked areas gusseted and a 1/2" bar welded between the last two tubes about six inches down. It hasn't cracked again in three years running. You can also put an exhaust hanger on the firewall. A better way is to put a 1/2" or 3/4" x 1/8" thick steel bar from a bell housing bolt to the exhaust. Use a muffler clamp on the exhaust pipe and drill the bar to go between the nuts and flat portion of the clamp. This is what AMC did with the tubular exhaust on the L-head, which is also prone to cracking without the brace. 

On January 2, 2005 Brien Tourville wrote:

> If the stock 72 intake
> won't work for some reason, you can get a stock 80-90 258 intake (84-
> 90 is Eagle or Jeep YJ).
> 
> The Jeep headers will usually hang down way to far even if they fit.
> You could try one for a 4.0L, but engine mounts or steering may get
> in
> the way.
> 
> 
> =================================
> 
> Get the '81 and up Intake manifold.
> AMC spent huge amounts of cash getting
> it to flow properly - and is all alloy - and
> is water heated / cooled.
> 
> The Moab Jeep race engine builders use this
> in preference above the Clifford  -  which they
> don't use.
> 
> They add a 4bbl carb adapter - and smooth it in.
> 
> The JEEP Wrangler header usually hangs down
> too far - but the Cherokee doesn't.
> 
> The Cherokee 4.0 header is the last bright hope
> for the AMC 6 Headers upgrade - need to find
> out definitively if it is only the '88 - '90  units
> or if the '91 - '99 HO units will work as well.
> 
> I believe the downward depth is OK - it is that
> with the '91 & up Manifold - the pipes gather
> more toward the center of the engine rather than
> at the rearward - as the '88-'90 do.
> 
> 
> 
>              Brien.
>          NEW YORK
>    eagle registry #501
> eagle kammback registry


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