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John Deere Tractors Discussion Forum
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JD A POWER BLOCK

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B 1935

06-02-2006 20:25:16




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I was wondering what the compression is suppose to be on an A power block? And how much horsepower does an A power block put out? What is the value of a complete power block?

Thanks for your time!




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DSK

06-04-2006 06:05:32




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 Re: JD A POWER BLOCK in reply to B 1935, 06-02-2006 20:25:16  
There were 3 differant Powerblocks for the model A's. All had a 6" bore & 6.5-1 c.r. The most expensive one is the #1 which fits tractors up to s.n. 584000. The most common and least expensive is the #2 which fits tractors s.n. 584000-647999. The #3 Powerblock fits Model A's from 648000-up as well as the Model 60. You probably don't have a $1500 block unless it's a #1 in very good condition with good pistons. There's a wide price range on all of these. I've seen nice #2's sell for as little as $250 at auctions. (without pistons).

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B 1935

06-04-2006 08:50:29




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 Re: JD A POWER BLOCK in reply to DSK, 06-04-2006 06:05:32  
DSK,
I am looking at buying an A with the power block in it. The cranking compression is 110 psi per cylinder. On top of the power block it reads POWER BLOCK then it has 6" on one side and then it has a - and then 1. Is this a #1 power block? And is this good compression?

Thanks



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Drew

06-04-2006 11:44:15




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 Re: JD A POWER BLOCK in reply to B 1935, 06-04-2006 08:50:29  
From what you describe, you are looking at a 6-1 block, which like DSK says, is the one that is really hard to come by. 110psi probably isnt TOO bad considering that the stock head that goes on a tractor the 6-1 fits is an all-fuel head.

I think $1500 is a streach price wise. I saw one bring $1200 on ebay, and personally sold one for $1200. If it needs work, it will be less than that.



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mjjk

06-03-2006 03:43:26




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 Re: JD A POWER BLOCK in reply to B 1935, 06-02-2006 20:25:16  
I have an A that I put 6.125 pistons in and with a stock crank and rods I was around the 65 hsp range.I have the pistons and misc for sale, it makes a good pulling motor and is very reliable, if interested get back to me.



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Duane Larson

06-02-2006 20:35:20




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 Re: JD A POWER BLOCK in reply to B 1935, 06-02-2006 20:25:16  
B 1935,
An A power block puts out about 47 hp, according to Tractor Supply who made and sold them. The compression ratio was raised to 6.5-1 (8-1 for LP pistons). A good, complete A power block with pistons, etc. seems to be around $1500 on eBay.



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