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JD B vs JD 50

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Phil

09-24-2001 10:15:56




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I have a '41 B, ser # 198,000 +/-. Can a high-compression "B" or "50" block be used & if so, what head should be used for maximum power.....Thanks




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WTW

09-24-2001 11:03:18




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 Re: JD B vs JD 50 in reply to Phil, 09-24-2001 10:15:56  
Phil, Even though the 50 was the tractor that replaced the B, the parts are quite different. The 50 was the same cubic inch displacement as the late model B but that is all there is about the same. The bolt pattern on the 50 block and cylinder head are different than the B. The head bolt pattern on the 50 also has one more stud in it. To answer your question on what to do would be consider putting in the late model B block in your 41 B as the bore sizes are different. The 41 had a stock bore of 4 1/2" and The late B had a stock bore 4 11/16" The late B block will bolt to your 41 case. The late B block could also be bored .125 or a little more without sleeving it. The next best option would be an aftermarket Powerblock if you could find one (Good Luck). They had a stock bore of 5" and can also be bored but pistons will have to be custom made ($$$). The 41 cylinder head has the same combustion chamber size as the late B head. The late B head is the original / correct parts replacement for the 41 head. The best head for performance on a B is an Hiesler head which like the Powerblock was an aftermarket head which too is hard find and high dollar if you do. Lots of options if you do not let money get in your way! Good Luck, Dave W.

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