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Tractor Pulling Discussion Forum

boring a JD A block

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JD puller

10-06-2003 14:40:40




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how big can I bore my unstyled A jd block with out having to put sleeves in it? I have been told that 5.875 is about the max but I think its to thin. let me know what all of you think.




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Jonathan

10-07-2003 18:25:39




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 Re: boring a JD A block in reply to JD puller, 10-06-2003 14:40:40  
Just a little tip while you have the jug off. Shave the block about .0125 DO NOT SHAVE THE HEAD. It will not gain you anything TRUST ME!
I have done it and a buddy off mine shaved the block-----BIG DIFFERENCE!
Email me back for more tricks on a JD.



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lynn

10-07-2003 17:15:49




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 Re: boring a JD A block in reply to JD puller, 10-06-2003 14:40:40  
JD puller..have 5.875 in my unstyled a and have run for 7 years and no problem..70 pistons work very well in my opinion..you have to leave the top of the cylinder unbored..about 3/4 to 1 inch so you have to load the pistons from the rear..helped a friend of mine put in cat pistons in a stlyed a last winter and they also worked..with 8 inch stroke in it he run a jerrys head to get the compession up as the pistons are short from the wrist pin to top and don't want to run ring into the spark plug hole..lynn

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jons

10-24-2003 21:02:48




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 Re: Re: boring a JD A block in reply to lynn, 10-07-2003 17:15:49  
question for lynn.
what year do you have that you put the 70 pistons in? were the pistons for a gas or diesel 70?
thanks jon



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a puller

10-06-2003 19:14:15




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 Re: boring a JD A block in reply to JD puller, 10-06-2003 14:40:40  
from what I have heard, most people go to 5.75 and use a cat...I think d7 piston or something like that.....ask "lynn"...he has this setup.



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rusty

10-06-2003 17:11:26




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 Re: boring a JD A block in reply to JD puller, 10-06-2003 14:40:40  
You can bore it that size if you have the right cast block, the one w/ 2 circles on top of the block (ie old casting marks) have thick enough sleeves to go 5 7/8.



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