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Big bore 70 JD

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BIGIRON

10-21-2002 09:46:13




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Is it possible to bore a 70 gas block (5-7/8") out enough to accept a G JD (6-1/8") piston? If any one has tried it please let me know how it all went.




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Seamo

10-21-2002 19:36:50




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 Re: Big bore 70 JD in reply to BIGIRON, 10-21-2002 09:46:13  
I looked in my old M&W book and we used to bore the 5.875 bore 70 gas and Lp to 6.125. The part # for the 70 gas for 6.125 is AP141. The part # for the 70Lp 6.125 bore is AP 143. M&W Hp on the stock 70 gas was 48.2 with 6.125 hp was 55.1 The hp on stock 70 Lp was 50.8 with M&W 6.125 bore the Hp was 56.7 Maybe this will help you make a decision. You might try Jerry Hinrichs 815-778-1900 he used to make the M&W duplicate for the 70 Deere other people might have them but I am not aware of any. Earl In Illinois

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Pat

10-21-2002 17:41:43




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 Re: Big bore 70 JD in reply to BIGIRON, 10-21-2002 09:46:13  
Big iron,
With a 70, you have several options! This is because the block to main case bolt pattern is the same on a G and a 70. The head bolt pattern is the same on a G and a 70 ALL-FUEL(gas has one more stud)The block cyl dia is identical in a G and 70 ALL-FUEL.

Best- Jerry's welding and machine can make a 7.5 inch block and pistons for your 70 that uses the 70 head for about 3,800 to 4,000! I would probably just get one for a G and get an after-market head, carb, and manifold.(A bit pricy)

Buy a G power block and a G after-market head. Buy a plain G block and G head,manifold,and carb.Then bore the G block and clean up the head! (Most REALISTIC)

The bad thing is, it will be hard to notice just a maximum rebore of the 70 block over a tight stock bore.

Stroking is where the MOST noticeable bang for the buck is!

Hope this helps, pat

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ToddF

10-21-2002 13:16:40




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 Re: Big bore 70 JD in reply to BIGIRON, 10-21-2002 09:46:13  
I bored mine to 6.108" to accept an aircraft piston that was 6.096". It looked to me like there was room to go roughly another 29 thousands without trouble to accept a 6.125" piston. I ran out of room in a lot more places trying to squeeze in the extra stroke than I did the extra bore. I don't know about the G piston with respect to wrist pin location, rod length or compression; somebody else will have to help you on that.

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