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1956 Dodge CR left hand Exhaust manifold needed 1634445
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Steve1956
Posted 2020-02-12 6:53 PM (#594144)
Subject: 1956 Dodge CR left hand Exhaust manifold needed 1634445


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As my left hand side manifold has been broken and crudely repaired, I am looking for a LHS manifold in good condition.

I hope someone can help me.

The casting number on the one I have is 1634445.

This is on a 1956 Dodge Custom Royal 315 V8 Poly motor.

If anyone can advise if a different casting number will also suit , I would be pleased to know.

I have looked at this question with the help of 56D500boy but the conclusion is still speculation.

Thanks, Steve
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56D500boy
Posted 2020-02-12 8:17 PM (#594150 - in reply to #594144)
Subject: RE: 1956 Dodge CR left hand Exhaust manifold needed 1634445



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Steve1956 - 2020-02-12 3:53 PM
The casting number on the one I have is 1634445.
This is on a 1956 Dodge Custom Royal 315 V8 Poly motor.
If anyone can advise if a different casting number will also suit , I would be pleased to know.
I have looked at this question with the help of 56D500boy but the conclusion is still speculation.


Hmm...I was pretty sure that I had convinced you that for the left side manifold the casting number 1634 445 was the part number as well, because there is nothing added to the casting.

The right side manifold is different because at least a couple of things (the heat tube for the choke and maybe the heat riser/flap valve) were added to the original right side casting, hence a PN that is different than the casting number.



(ExhaustManifoldPNs.jpg)



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Attachments ExhaustManifoldPNs.jpg (216KB - 10 downloads)
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Steve1956
Posted 2020-02-12 11:43 PM (#594153 - in reply to #594150)
Subject: RE: 1956 Dodge CR left hand Exhaust manifold needed 1634445


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No issues re the 1634 445 part no, I just wondered if anyone knew for sure for example, that a 270 left exhaust say #1533784 may also fit the 315 ??



As we discussed, I think I have a unique right side manifold due to it being RHD. The casting number on that one seems to be 1637 584? It definitely has a crack, which means if it is unique and correct for 56 being for RHD, I'll have to face up to getting it repaired. All your input accepted and gratefully received Dave.

Steve
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56D500boy
Posted 2020-02-13 1:10 PM (#594182 - in reply to #594153)
Subject: RE: 1956 Dodge CR left hand Exhaust manifold needed 1634445



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A couple of things:

1. I did not know this until last year: For most of the Mopar V8s (at least during the 55-58 period, if not beyond), for *NON*-Air Conditioning cars, the left and right cylinder heads are exactly the same, even the same Part Number (PN). A/C left and right are different presumably because of the need to have mounting bosses for the big and heavy A/C compressor (and brackets).

2. Left and right V8 exhaust manifolds are different (at least during the 55-58 period, if not beyond), presumably because of a) the need to clear the steering box on the LHD cars and b) the need for generator mounting bosses on the right manifold for the non-Power Steering (PS) cars. (The PS cars mounted the generator on the left head and drove the PS pump off the back of the generator (at least for 55 and 56).

That said, they didn't do a "log" (long runner with an end exit) on the right side of a LHD V8 for a good reason, i.e. a center dump is more efficient than the log-style.

Based on the above, for your RHD situation, and the fact that the Left and Right heads are the same, and you don't have a steering box on the left frame rail, you could run a RHS center dump manifold from a LHD V8 on the LHS of your engine. (The down pipe would have to be different to capture the center dump).

Based on what I see from the PNs below, that while the 270 poly head in the 55 (D55-1 and D55-2 non-hemi) Dodges (and 55 Plymouths) have a PN of 1552 947, for 1956 Dodges, the non-hemi (non-D500) head with PN 1632 098 does not distinguish between 270 Coronet (D63-1) poly and 315 (Royal D63-2 and Custom Royal D63-3) poly, implying that a 56 poly manifold is a 56 poly manifold (no issues).

But yes, it is presumptive. Perhaps someone like Nathan (Powerflite) can add a comment to this. (Nathan?)



Edited by 56D500boy 2020-02-13 2:02 PM




(55-58DodgeV8HeadPNs.jpg)



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Attachments 55-58DodgeV8HeadPNs.jpg (157KB - 6 downloads)
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Powerflite
Posted 2020-02-13 3:33 PM (#594186 - in reply to #594144)
Subject: Re: 1956 Dodge CR left hand Exhaust manifold needed 1634445



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Yes, any Dodge poly motor will have a set of exhaust manifolds that will bolt to your motor. Dodge poly manifolds from '57-'58 will also work, and from the DeSoto Firesweep as well. There may be differences in port size, outlet diameter, choke tubes, generator mounts, heat risers, etc..., but I would expect all the poly manifolds to be very similar because they only had a limited run. And most of those possible differences are only possibilities on the right side, not the left. I recently sold my extra left side manifold so I don't have one available anymore. Did you check with John at BigM or Gary Grossitch? They can probably help you out.
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Steve1956
Posted 2020-02-13 6:05 PM (#594191 - in reply to #594186)
Subject: Re: 1956 Dodge CR left hand Exhaust manifold needed 1634445


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Thanks 56D500boy and Powerflite.

I am just trying to be sure I understand what will work and what won't, otherwise i could make an expensive mistake. I am keen on fitting a replacement manifold on the RHS, and I have seen locally a D55 factory RHD that has a RHS manifold #1553783 casting no. (centre dump). The clearance with the RHD steering box is tight, but it works. Interesting , it has a centre dump LHS side manifold, but I cannot be sure of the casting number...it looked like 1637790 ???

So possibilities are opening up...some of these appear on ebay( e.g 1553783) . I am yet to contact BigM etc as advised cause I want to know what I want or can use.

Powerflite, your comment makes me want to ask ( I am no mechanic) if I obtained say 270 manifolds that had a smaller port size or outlet diameter, would this affect engine performance.? Could I change this if I needed to?

Also I wonder if a LHS centre dump manifold exists ( or RHS applied to LHS) that I could use that does not have a tube for the Carb choke thermostat, as I would already have one on the right side ? ( I did not look at this when checking out the D55 RHD. I'll have to go back sometime)

Sorry about all these questions, but it can get frustrating trying to understand all the possibilities when you can't roll into a wreckers yard somewhere and look at some examples !!

Steve
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Powerflite
Posted 2020-02-13 9:51 PM (#594202 - in reply to #594144)
Subject: Re: 1956 Dodge CR left hand Exhaust manifold needed 1634445



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Will smaller port affect performance? Of course! How much is the question. Just call BigM and tell him what you want: '56 Dodge left poly manifold. He probably has it.
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Steve1956
Posted 2020-02-14 5:10 PM (#594274 - in reply to #594202)
Subject: Re: 1956 Dodge CR left hand Exhaust manifold needed 1634445


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Posts: 29
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I've emailed John at BigM , so I hope I get lucky.

I'll update if I get some results. Thanks for info so far all.
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