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'65 Dodge Motor Decision

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Larry Roa

06-05-2005 18:27:24




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I have a 1965 Dodge 3/4 Ton 4x4 Flatbed with one ton axles and a military two speed manual transmission. Presently, it has a tired 318 Y block in it. I am debating rebuilding that motor or putting in something different. I want to be able to pull a 20 foot fifth wheel equipment trailer with it at 55 miles an hour on the highway with a thousand pound load(raw lumber) on it. Am I dreaming? Should I give up on this rig and just save up for something newer? What's your opinion?

Larry Roa

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Hal/WA

06-05-2005 21:24:47




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 Re: '65 Dodge Motor Decision in reply to Larry Roa, 06-05-2005 18:27:24  
I would consider putting in a 360 LA engine for a bit more power and torque, as well as availability. There are lots of them out there. I think the LA engine would bolt up in place of your A 318, but you need a different flywheel to use the 360, as it is externally balanced. For use in a hauling truck, you want to keep the compression ratio fairly low and the camshaft mild for good low end torque and to avoid detonation.

I would try to get a 4 barrel manifold and carb, for a little more power and believe it or not, fuel economy. The 360 2 barrel carbs were big and thirsty.

If the rest of your Dodge is in good shape, I would sure keep it. They don't build them that tough any more! And very simple and easy to work on too. Have fun!

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Larry Roa

06-06-2005 08:15:58




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 Re: Re: '65 Dodge Motor Decision in reply to Hal/WA, 06-05-2005 21:24:47  
Hal, Do have any favorites when it comes to carburators for this setup? I'm heading into town today and will look around for a 360 for this job. I have a spare 383 out in the shop. but I thought it might be a little expensive to feed at todays gas prices. Thanks for the info.

Larry Roa



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Hal/WA

06-11-2005 03:21:03




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 Re: Re: Re: '65 Dodge Motor Decision in reply to Larry Roa, 06-06-2005 08:15:58  
Sorry, I have been tied up for a couple of days. I like the old tried and true Carter AFB. They are not very expensive new, are easy to tune if you have to and just seem to keep working forever. But you need the right manifold, which probably means a 68-71 340 or an aftermarket square base.

The later manifolds for the Thermoquad are also out there, but from what I have heard, the Thermoquad is hard to get parts for and many have damaged plastic main bodies. You could put a Rochester Quadrajet on one of these manifolds, but I think the late factory carbs with Mopar linkage are emission carbs that have their own problems.

Another choice would be an early factory Carter AVS, which is similar to an AFB. I have read that Edelbrock is making these again, so parts might be just fine. But I have no experience with working on an AVS.

The AFB has always worked well for me and I have used them on several engines.

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Kent of SW MO

06-06-2005 15:58:32




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 Re: Re: Re: '65 Dodge Motor Decision in reply to Larry Roa, 06-06-2005 08:15:58  
383 is a B-block. You would need a B-block bellhousing. A couple of year ago I replaced a tried 318 in a '67 D 400 (1 1/4 ton) with a 360. Set it up for dual fuel, gasoline and LP, I pull a 4500lb empty trailer with it. Do not ask about the trailer, when in dout build it stout it does not have to fly. I sometimes have a combind header on this trailer.

Kent



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Larry Roa

06-06-2005 18:55:05




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 Re: Re: Re: Re: '65 Dodge Motor Decision in reply to Kent of SW MO, 06-06-2005 15:58:32  
I have a 383 Dodge engine with the transmission still attached to it out in the shop. Many years ago a guy told me he was going to scrap out his car and told me I could have anything I wanted off of it for $100 . I went to town on it but never fiquered out what to do with the engine and transmission (did find uses for other parts). How did your truck pull with the 360 in it? I travel through Arkansas picking up rough-sawn oak to support my wood shaving and sawdust habit and need a strong (not necessarily fast) puller.

Larry Roa

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Kent of SW MO

06-07-2005 04:45:22




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 Re: Re: Re: Re: Re: '65 Dodge Motor Decision in reply to Larry Roa, 06-06-2005 18:55:05  
I could tell my power was up. The old 318 was a car motor(internal balance) that had been used to replace the 318-3 truck motor ( external balance) using the external balance harmonic damper and flywheel on the internal balance engine. I could not feel it vibrate but it was pounding out the main and rod bearings. You could almost see the oil pressure move lower as you drove the truck. I used a 361,383 2-barrel carb from the late 50's or early 60's as there was no PVC port. I built a spacer plate for the PVC port. This carb. has a LP carb. on top of it. I could not tell any loss off power when running on LP. In fact the engine would start like a fuel injected engine on LP. With the truck in neutral just reach in an turn the key. no setting the choke or anything. It would start right up. I have towed C-II gleaner combinds behind this truck on a tow bar.

Kent

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