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JD A Puller

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LJS

11-24-2002 16:53:49




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I have been told that you can take a JD A, bore it to fit 70 gas pistons. Obvious other things would have to changed Rods/etc but my main question is, Will the block take these pistons, how much a bore over standard is this?


Thanks

LJS




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Mike 3

11-25-2002 17:30:47




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 Re: JD A Puller in reply to LJS , 11-24-2002 16:53:49  
An unstyled A block can usualy be bored to 5 7/8" from the original 5 1/2" Bore if the block was casted straight and without any sand pockets in the bores Find some 70 gas pistons they will have a 5 7/8" diameter.The wrist pin won't be much problem, If needed the rod bushing can be bored to fit the piston pin. To get the most from this bore job a stroked crankshaft should be used. put big valves in the head and make her breath. some people like to use modifed cam shafts, I haven'nt found a cam that does anything to help.

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Mike F

11-25-2002 16:54:55




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 Re: JD A Puller in reply to LJS , 11-24-2002 16:53:49  
using 70 pistons that are standard bore, going that it's a gas piston, would be 5 and 3/4" inch bore. A stock A is 5 and 1/2". The 70 all fuel pistons are 6 and 1/8". These will not fit unless you get an A powerblock and bore it .125 over, I had a fairly big A a while ago, I intend to build a new one in a few years, might just go enough to get about 60 hp.



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