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Power Block and Cam?

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ToddF

04-09-2003 09:26:56




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We have a 1947 JD A that we are building for pulling. Which power block will fit this tractor? My understanding is that there are 3 different power blocks, and I don't know which one I need to be looking for. Can anybody enlighten me?




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WTW

04-09-2003 09:51:29




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 Re: Power Block and Cam? in reply to ToddF, 04-09-2003 09:26:56  
The 6-1 was for the 1940-1946 model "A". The 6-2 was for the 1947-1949 model "A". The 6-3 was for the 1950-1952 model "A" and the model "60". They all had different block to case and water manifold bolt patterns. They did share all the same head bolt patterns. The 6-1 had frame mounting holes in the bottom where the 6-2 did not. The 6-3 had frame mounting holes in the bottom for the "60" application, these holes were not used on the late "A".

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2 cylinder

04-09-2003 09:50:20




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 Re: Power Block and Cam? in reply to ToddF, 04-09-2003 09:26:56  
You need the #2 powerblock for your 47 JD-A. I put one in my 47 JD-A with .125 over high compression pistons, a cold manifold thats ported, head milled .125 and ported with 3 angle valve job, and oil bath removed. It turns 55hp on the dyno.



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