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232 - Which headers/exhaust manifold should I use?

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mjt084 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote mjt084 Quote  Post ReplyReply Direct Link To This Post Topic: 232 - Which headers/exhaust manifold should I use?
    Posted: Dec/29/2017 at 12:47am
Hi All,

I’m working on mildly warming up a 1970 model 232 which has been transplanted into my 1963 Classic Wagon the process is
Complicated somewhat by the fact that I’m in Australia and AMC parts are rare let alone AMC six parts.

So far I have;

- Offenhauser 6257DP;
- Webber 38DGAS Carb;
- Offenhauser/Webber adapted plate;
- Air Filter to suit Webber Carb.

As I understand it my 70s era exhaust manifold won’t suit the Offy intake manifold and I either need to look into headers or an exhaust manifold from a 80s era six? Are there any great benefits to be had from headers or am I better off to just pickup the later exhaust manifold?

Any other suggestions?

Thanks!
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232jav3sp View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 232jav3sp Quote  Post ReplyReply Direct Link To This Post Posted: Dec/30/2017 at 10:48am
Problem is finding a header that clears the starter. Since you don't have the steering shaft running along side the starter, like we in the States do, you might have better Luke using/making one fit. Otherwise, just use a manifold from an Eagle. They are a nicer unit over the earlier style that is on your car.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote tached_out Quote  Post ReplyReply Direct Link To This Post Posted: Dec/30/2017 at 3:27pm
Here is the solution to your problem.

http://theamcforum.com/forum/six-cylinder-racing-header_topic91389.html
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Post Options Post Options   Thanks (0) Thanks(0)   Quote tyrodtom Quote  Post ReplyReply Direct Link To This Post Posted: Dec/30/2017 at 6:18pm
Offenhauser makes, or made a intake specifically meant for use with the stock exhaust manifold like used in the early 64-79?  It may not be in stock at Summit,  but Summit isn't the only place you can buy Offy intakes from.

What I do question is why you use a carb with both barrels opening at the same time on a intake meant for a carb with a primary, and secondary sections opening at different times.  Primary for low demand driving, secondaries added when more HP is needed.

You get no benefit from the dual-port Offy with the carb you've picked.  I would just pick a open plenum intake with that carb.  Offenhauser makes open plenum intakes for the AMC 6 also.
66 American SW, 66 American 2dr, 82 J10, 70 Hornet, Pound, Va.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote farna Quote  Post ReplyReply Direct Link To This Post Posted: Jan/02/2018 at 9:36am
I have to agree about the Weber carb. That intake is really intended for a 4V carb. You could make it work as intended with a 32/36, but would need a divider in the adapter plate. I suppose the Offy intake might be better than stock though, even if the "dual port" function is negated. Wish Webber made a progressive 38/38 (or 36/38)!!

You can use any stock AMC exhaust manifold from late 1980-88 (aluminum intake that doesn't bolt to exhaust manifold) or from any 87-90 Jeep Wrangler with 4.2L (258).  Years are US vehicles, may vary in Oz.
Frank Swygert
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Pdok Quote  Post ReplyReply Direct Link To This Post Posted: Jan/02/2018 at 9:58am
My opinion, you're better off with a stock-type 2V intake with that carb, and save the $ from the Offy intake.  I've put the 38DGAS on the Clifford intake, and on a mid-80s Jeep aluminum intake, with a hot cam.  No difference noted in performance.  I already had the Clifford headers, however, which I think do make a difference, given my cam.

If you haven't picked a hot cam, or only slightly increasing lift, then I'd not expect much benefit from just swapping the intake itself. The carb is the key piece at that level of performance [well, after you've decided on cam].  Put the Weber on any 2V intake, and that's where you feel it. Gasket match the intake/exhaust ports if you feel like it.  A single exhaust pipe on a mild cam is fine.  

Even with my clifford header, I'm running it into a (larger) single, and I love it so far.

Worth noting that your cam choice will greatly affect how that Weber tunes up.
76 Grem X 258/904,4.0 head/MPFI, Comp X250H cam, Hughes springs, Clifford header, serpentine swap.
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