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John Deere Tractors Discussion Forum
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What exactly is a power block?

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BDM

01-03-2007 20:28:33




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I see mention of Power Block's here & there. I assume it's a larger bore block? Anything special besides that?




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Duane Larson

01-04-2007 06:15:00




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 Re: What exactly is a power block? in reply to BDM, 01-03-2007 20:28:33  
BDM,
Power Blocks were designed and built by Tractor Supply Company (TSC). They were first offered in the 1957 Blue Book catalog, and last offered in the February 1971 spring catalog. They were offered for the A, B, G, 50, 60, and 70 models. Bore for the B and 50 was increased to 5", for the A and 60 the bore was 6", and for the G and 70 the bore was 6.5". The biggest hp increase was for the G, from 39 to 63 hp, part of that increase being the change from distillate to gas.

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BDM

01-04-2007 17:38:08




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 Re: What exactly is a power block? in reply to Duane Larson, 01-04-2007 06:15:00  
Thanks guys. That explains it :-)



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DSK

01-03-2007 21:01:56




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 Re: What exactly is a power block? in reply to BDM, 01-03-2007 20:28:33  
Powerblocks were sold by TSC back in the early 1960's They were a complete new block casting with pressed in wet sleeves. They were sold with pistons and generally had a 1/2-5/8" larger bore than the OEM block. Compression ratio was 6.5-1.TSC claimed a 10-15HP increase depending on the model tractor and what type of components it was replacing. Good ones are getting harder to find and command a good price. They are mostly bought up by tractor pullers or parts jockeys. They were never sold by or endorsed by Deere, but there were JD shops installing them back then. Many of the tractors that recieved a Powerblock were taken back home to be worked to death pulling a plow 1 bottom too big for the design of the tractors drive train and ultimately scrapped.

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jddriver

01-04-2007 05:35:48




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 Re: What exactly is a power block? in reply to DSK, 01-03-2007 21:01:56  
Another purist that doesn't like modifying a factory setup.We have a 60 with one in it and has had the sme engine since 1963 and has ground 1000's of loads of feed and planted and everything else that a farm tractor does.



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buickanddeere

01-04-2007 14:24:22




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 Re: What exactly is a power block? in reply to jddriver, 01-04-2007 05:35:48  
You proably maintained your 60.Din't lug the guts out of it and it's tuned/fed good fuel so it doesn't knock.



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