392 Hemi conversion

Discussion of the 331-354-392 HEMIs.

Moderators: TrWaters, 392heminut, scottm

392 Hemi conversion

Postby Hemi07 » Tue Jul 03, 2007 9:16 pm

Hello,

I am new to this site, so I hope I am posting this in the correct forum.

I have a chance to trade my 383 HP motor out of my 1969 Charger, for a fresh rebuilt 392. my motor and tranny are also fresh rebuilds. I was wondering if this is worth it.

Plus I would like to know how hard it is to do this conversion.

any help and guidance would be appreciated.

Thanks
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Postby 392heminut » Wed Jul 04, 2007 12:04 am

If you go to the bottom of the home page for this site and click on the Tips & Tricks link, then click on the Early Hemi to B&E Body Engine Swap article, then click the link to the PDF file you can read my article on that swap. You can also check out the other article by Mopar Charlie, which has some good info, but also has some misleading info too. The biggest hassle to the swap is the problem of headers if you don't want to run factory exhaust manifolds, there aren't any off the shelf that will fit and you will have to modify some as described in my article. Otherwise it's not too hard of a swap, but to be brutally honest with you, you can probably get more power out of a well built B or RB engine and carry 100 lbs less weight over the front suspension. All things being equal, the rebuilt 392 is worth more than a rebuilt 383, and if you're more interested in seeing a big set of hemi valve covers under your hood than in how much horsepower you can put to the ground then I would say go for it!
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Postby Hemi07 » Wed Jul 04, 2007 6:49 pm

Thanks for the info, I could really care less about how much power is going to the ground, I mostly go to car shows and cruise ins. Plus I would love to see a big set of Hemi Valve covers under the hood.

Again thanks for help!!
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Postby 392heminut » Thu Jul 05, 2007 9:35 am

If you decide to go ahead with the swap and have more questions go ahead and email me, my email address is at the bottom of the swap article. I'm going to be pulling my heads in the next few weeks and since I finally got a digital camera I'm hoping to get some pictures of the modified headers and motor mount brackets to Scott to add to the article.
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Postby Powerflite » Thu Jul 05, 2007 10:10 pm

I have performed a 392 hemi swap in a few cars now including a 68 A-body Barracuda, a 56 Savoy, and a Dodge truck. I wouldn't even consider putting one in a car you wanted to drive much without cutting a lot of weight off of them. The cars handle horribly with all the extra weight of a stock 392 motor. The problem is that a lot of that weight is up high where it really hurts too. You can lose a lot of weight by using an aluminum intake, heads and water pump. Do that and deal with the pain of custom headers, and you will have a nice setup. I think a 426 crate motor would be better for a Charger, but if you don't have the $$, a 392 might be a good alternative.
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Postby Hemi07 » Fri Jul 06, 2007 3:20 pm

I would love a crate 426, just don't have the cash. I was reading the article on the conversion, and now I am not sure as I would have to lose the power steering and the power brakes. I really like having both of those on my charger. But at the same time I would love to have the hemi in it.

Thanks for all of the help from all of you guys!!
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Postby 392heminut » Sat Jul 07, 2007 1:05 am

Your other option would be to go the 5.7 Hemi route. That is what I'm doing. I picked one up for $1,700, but the engine management system will probably cost more than the engine. With TTI's help (they make headers and motor mount brackets for the swap) it's pretty much a bolt in and I can put my power steering and power brakes back on. Just something else you might consider, and it would still cost less than a 426 crate hemi.
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Postby Hemi07 » Mon Jul 09, 2007 11:13 pm

I thought about one of the new ones, but I really like the old school look.

I also may have a stupid question, I have seen a couple of 69 charger 500 with 426 hemis in them and they still have the power brakes and stuff. So I guess my question is, what is the reason that stuff won't fit when you use a 392?

Thanks
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Postby Moparlee » Tue Jul 10, 2007 9:17 am

The 392 is wider if I'm not mistaken. I'm not so sure you can't use power brakes if you get the small booster and you the sissor stuff from a 70 up A-body. It would be a trail and error deal, I don't have any experience making that work though. Just throwing out ideas.

Lee
392 Hemi
354 cracked and needs a sleeve
241 or 270 the only running one I have
340/E-brock heads/six-pack/4-speed/mini tubed/spool-64 Valiant
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Postby Powerflite » Tue Jul 10, 2007 9:37 pm

I agree. I believe it is wider and the exhaust exits at a lower angle than the 426. I used one of those brake linkage arms or scissors from a later A-body on my 68 Barracuda. It looks a little goofy to me, but it works. There may be some adaptation required to use it on the B-body, I'm not sure. The exhaust is very tight around the manual steering box as it is; but you should be able to have power steering by swapping over to a power rack and pinion at the same time. This would reduce the weight of the car and give you much more room for your exhaust.
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Postby Moparlee » Wed Jul 11, 2007 7:43 am

When I say that I don't have experience of not making the scissor work, I actually had it set up in my early A with a sb mopar of course. Just not with an early Hemi. But I bet it would work if it would clear the hood on the B-body's or E's for that matter.

Lee
392 Hemi
354 cracked and needs a sleeve
241 or 270 the only running one I have
340/E-brock heads/six-pack/4-speed/mini tubed/spool-64 Valiant
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Postby Hemi07 » Thu Jul 12, 2007 2:12 pm

I will have to look and see what this cost. as I said I rebuilt the 383 hp motor, and it runs real good. maybe I will just get lucky and find a 426 some day.
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Re: 392 Hemi conversion

Postby NE57 » Sat Apr 17, 2010 2:50 pm

>> by 392heminut » Thu Jul 05, 2007 9:35 am

If you decide to go ahead with the swap and have more questions go ahead and email me, my email address is at the bottom of the swap article. I'm going to be pulling my heads in the next few weeks and since I finally got a digital camera I'm hoping to get some pictures of the modified headers and motor mount brackets to Scott to add to the article.<<


Larry, Did you ever get those pics?
Neil
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Re: 392 Hemi conversion

Postby 392heminut » Sun Apr 18, 2010 12:34 pm

Neil, that is an old post! If you need pics of something specific let me know and I'll try to accommodate you. I put stuff on the back burner and it doesn't get done. This last year has been especially bad, my son is graduating and he has been wrestling all over the place and with me working on a wrestling scholarship for him a lot of other stuff has gone undone! :cry:
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Re: 392 Hemi conversion

Postby NE57 » Mon Apr 19, 2010 12:19 pm

I'm a ways off yet before I have to deal with the headers and steering box problem but if/when you get around to it, I would appreciate a pic of what you did.

In the meantime I'm drumming my fingers waiting for my block/crank to come back. Tum dee dum dum. Gives me time to think/plan.
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