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Hemi Powered '56 Plymouth
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Mopar1
Posted 2019-12-03 6:58 AM (#591037 - in reply to #591028)
Subject: Re: Hemi Powered '56 Plymouth



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Powerflite - 2019-12-02 7:05 PM

What would you do for it, other than nothing?
I didn't stick any 331 badges n my '60 Plym….
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Handygun
Posted 2019-12-10 7:30 PM (#591425 - in reply to #480421)
Subject: Re: Hemi Powered '56 Plymouth


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Nathan in past conversations we've had I told you your car was a inspiration for me to build a FL car with a early Chrysler. When I was having grief fitting a decent free flowing exhaust in my Plymouth, Chaney (Dukeboy) suggested using a front frame clip from a crown vic-impala-Dakota and I thought no way would I get rid of torsion bars for coils especially on a 57-58 car however in your case to me it doesn't seem bad. You would pick up room, get rid of kingpins, better brakes, parts avail anywhere, a swaybar, etc etc just a thought. And I still dig your car hydramatic or not.
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Powerflite
Posted 2019-12-10 8:05 PM (#591428 - in reply to #480421)
Subject: Re: Hemi Powered '56 Plymouth



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A rack & pinion would give me more space, but I'm not fond of such suspension conversions. If this were the only car I played with, I might consider doing some trial & error with frame & suspension changes, but I just don't have the time or interest in going down that road. Not only that, but I have already finished the hard part of making the headers so I'm not going to back away now. I'm not really looking for stellar performance, just trying to get the exhaust from pointing straight down and getting it off the ground. I picked the 700R4 because I believe it is the best overdrive trans out there that doesn't use a computer. But I find that the overdrive isn't really needed with an automatic, so if I were to do it over again, I would just install a pushbutton 727 so I could still get park and use the buttons. Using the buttons & having park too on this overdrive trans is more trouble than it's worth so I'm shifting it with a hand cable instead. When the time comes that I stop using it to tow my camping trailer in the mountains, and I can live without park, I'll hook it up to the pushbuttons again.

By the way, I think I figured out why the motor would backfire under load. Once I took it apart, I found that the timing chain was VERY loose. Makes sense, but I tried measuring the slack with the distributor and only measured five degrees of play so it didn't sound bad. But checking out the chain directly, it feels pretty loose. I'll try measuring the slack at the cam and see how it compares, but I suspect that I just didn't measure it accurately enough at the distributor.
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Powerflite
Posted 2020-01-19 1:17 PM (#593192 - in reply to #480421)
Subject: RE: Hemi Powered '56 Plymouth



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The motor is finally starting to come together on this seemingly never-ending project. Got the heads back from machining & assembly and put them on, along with the new Isky camshaft. I moved the motor over to get the left side header installed too. I had to remove all the exhaust studs on that side to make it work. Hopefully I can get this thing together again soon and get started on the cam break in.



(56Plym Heads On.jpg)



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Attachments 56Plym Heads On.jpg (191KB - 28 downloads)
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Powerflite
Posted 2020-01-26 11:47 AM (#593407 - in reply to #480421)
Subject: RE: Hemi Powered '56 Plymouth



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I got the exhaust installed, bolted and welded up yesterday. It took me 2 hours to get one bolt on the left side done because I didn't leave enough clearance to the pipe. So it made it very picky about the positioning of the wrench to install it. I had to modify the backside of the left motor mount to make room for it. But all the rest went in easier than I expected once I made an extra long Allen wrench socket from a crap Chinese Harbor Freight one and a good US made ball head Allen wrench. The Chinese ball socket doesn't swivel worth crap. They put the wrong dimensions on it for some reason. The left header is angled down more and required a bend in the pipe. I just cut a section and welded it in at an angle to compensate for it since the angle isn't large. My upside down welding skills aren't the greatest, but they should work well. While the car has been on jackstands, the trans fluid started leaking out the speedometer cable for some reason. I had replaced all those seals when I first installed the trans so they shouldn't be bad already. But I purchased new seals for it and will install them next week to keep it from leaking any more.



(56Plym New Headers Installed.jpg)



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Attachments 56Plym New Headers Installed.jpg (146KB - 27 downloads)
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Powerflite
Posted 2020-02-07 12:22 AM (#593902 - in reply to #480421)
Subject: RE: Hemi Powered '56 Plymouth



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I'm wrapping up the final assembly on the engine bay now. Getting close to doing the cam break in. I cleaned up these truck valve covers and painted them silver instead of gold to more closely match how Chrysler would have installed one of their motors into a '56 Plymouth, had they done so back then. I also tried to clean up and paint a lot of the engine bay parts & inner fenders, to make it more presentable than it was. Eventually, I'll get to re-painting the air cleaner as well.

It turned out that the trans was leaking through the speedometer gear because the plastic Chevy gear had worn a grove around it that the fluid passed through. So I purchased a new gear with a few less teeth to make the speedometer more accurate and replaced it. It doesn't leak anymore so far, but I won't know for sure until I get more fluid into the trans. The alternator wiring revealed a section of old original wires that had disintegrated insulation on one section so I have to replace that harness before I can go any further. Hopefully I can get it all done & ready to go by the weekend.

Edited by Powerflite 2020-02-07 12:30 AM




(56Plym Engine Assembled.jpg)



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Attachments 56Plym Engine Assembled.jpg (222KB - 25 downloads)
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