Re: 4.0 -again -- manifolds for the older motor

[farna@xxxxxxx]

Tom's suggestion is the best if you can find them -- any AMC cars and Jeeps will have them. A few have bolted 1V carbs like the old venerable Carter YF to the EFI manifold and had satisfactory results. The only things to watch out for when using 1980+ mainfolds are the support studs (same as I mentioned with the older ones -- mark and drill/tap for screw) and the "washers" that clamp the manifolds to the head are no longer big enough. Most cut 1/4" metal plates to fit.

Speaking of adapters, many Jeepers run little 390 CFM Holley 4V carbs with adapters on the 2V manifold. They get more low end torque that way though it might limit high rpm HP. For a street driver I would consider that route. You can run a little higher gear that way too. It will still have a little more top end than with the BBD. 


On September 7, 2005 Tom Jennings wrote:

> On Wed, 7 Sep 2005 farna@xxxxxxx wrote:
> 
> > 1. The intake and exhaust manifolds aren't normally used. You
> > ....  The only problem
> > with this is cold weather driving is highly affected -- takes a
> > while to get the engine up to operating temps.
> 
> Get an 81-up six intake manifold. It's aluminum, and is *water
> heated* (or, if you like, water cooled!) This thing does the job
> right -- that exhaust-heated manifold is crap.
> 
> For 81-up they split the int and exh maifolds. They will bolt onto
> the older engine. They're common as dirt.
> 
> The biggest problem is that as far as I know, they are all
> 2-barrel, and have the Carter BBD pattern.  You could use an
> adapter in a pinch -- I can tell you it fits, but might push the
> aircleaner into the hood, and you'll need to fabricate throttle
> linkage stuff.
> 
> It also saves nearly 30 lbs. from the driver side of the car! You
> gotta get "Y"'s for the water hoses, that's cheap. There's also an
> electric heater under the thing for fast warmup in cold weather,
> but I left that unconnected.
> 
> There is also EGR plumbing; the simplest is to leave all th EGR
> junk in place and don't apply vaccum to it, it'll be the same as a
> plug. You can plug the intake side with a simple flat plate, but
> the exh mani has a large and odd pipe thread; you could weld up an
> old EGR metal flex hose (comes with the junkyard parts) as a plug.
> 
> It's got lots of water and vacuum bungs. I think it's well worth
> 
> the adaptation hassle for carburetor or TBI cars.


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