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John Deere Tractors Discussion Forum
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1946 b block rebuild or interchange

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Maureen

01-04-2006 18:48:41




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I have a 1946 b allfuel that I am planning on pulling next year. I'm looking for more horsepower and was wondering if I can swap a block from 1950 B to gain the bigger bore and higher compression pistons. The 46' has a 4.5' bore and the 1950 has the 4.6". Can the blocks interchange or should I just stick with the stock block? Any kind of help would be great!!




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Maureen

01-07-2006 16:50:39




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 Re: 1946 b block rebuild or interchange in reply to Maureen, 01-04-2006 18:48:41  
Thanks everyone for the info. I think I will stay with the stock block. I found a cold manifold but haven"t found the M&W pistons. I"ll do more searching and get my B ready for spring. Thanks again!!



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DickD

01-06-2006 11:44:03




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 Re: 1946 b block rebuild or interchange in reply to Maureen, 01-04-2006 18:48:41  
Maureen; I have a 44 B that I bored .187 and put a set of M&W gas B pistons in. Also took .100 off the block. I only used it for pulling, so I didn't put a water pump on it. I never had it on a dyno, but it really made a good showing at the tractor pulls.



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Mike M

01-05-2006 17:07:20




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 Re: 1946 b block rebuild or interchange in reply to Maureen, 01-04-2006 18:48:41  
I've never done it but heard several tales of people boring them out to accept the pistons of the later B. This was back when they were still working them in the fields. It seems like alot of metal removed to me ? Some blocks may not make it.



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hahter

01-04-2006 19:20:07




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 Re: 1946 b block rebuild or interchange in reply to Maureen, 01-04-2006 18:48:41  
If your block is fine I would bore the cyclinder over-sized and put in high-compression alunimun pistons. I think that you will come out better that route than buying the other engine. You never know how hard that other engine had been run and the condition of the cyclinders. I would also put on a "cold" gas manifold on the engine. Just my suggestion hope it helps.
Terry



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van robinson

01-05-2006 00:34:23




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 Re: 1946 b block rebuild or interchange in reply to hahter, 01-04-2006 19:20:07  
Where could I find a "cold manifold" for a '40 B?



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hahter

01-05-2006 02:29:48




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 Re: 1946 b block rebuild or interchange in reply to van robinson, 01-05-2006 00:34:23  
You can give Detwiler Tractor Parts a call at (715) 659-4252.



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