John Deere D overbore

Cal/ MI · Jan 1, 2011

Has anyone bored a JD D .250 over? I have a block that does not look like it will cleanup at .125. Sharp sells pistons .250 over but I am concerned about cylinder wall thickness boring that much. I was wondering if anyone had experience.

jd b puller · Jan 1, 2011

yes, you can normally bore them to 7" if it's a styled one with the 6.75" bore.

Pistons are expensive, but so is resleeving to reuse pistons.

Let me know if you need help.

buickanddeere · Jan 1, 2011

Dual stacks for those D's too.
Add some compression, the 7" bore and a Berry's Cam and the old girls make a surprising amount of HP.

John Deere D overbore

Cal/ MI

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jd b puller

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buickanddeere

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