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Tractor Pulling Discussion Forum

Stroking An A John Deere-

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730-LP

07-09-2007 21:32:32




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I have an A John Deere with a power block.I plan on boreing.125 and putting standard bore gas G pistons in it and would like to stroke it 1"or1.5".Is there any rods that can be used with out cutting and welding them up? or how much can you stroke one and still use the A rods and put a spacer plate between the block and the crank case housing? thanks




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kendak

08-03-2007 08:49:30




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 Re: Stroking An A John Deere- in reply to 730-LP, 07-09-2007 21:32:32  
Listen to WTW ...I spent $900 on pistons before finding the right ones ...my 37"A" has PB bored to fit Curtis-Wright pistons [9.25 X 6.117]..get the pistons FIRST...then have it bored ..ask for Gary [214-357-9331] at JT Luckey [spelling?]in TX....Kent



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WTW

07-10-2007 08:15:34




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 Re: Stroking An A John Deere- in reply to 730-LP, 07-09-2007 21:32:32  
First and most important, do your home work and study your lesson before and I repeat before you start buying and machining parts, If you don't you will find out you spent allot of money to learn I should of done it different. The most important thing to decide first is just what size of engine do I want to end up with as if you do plan on stroking this tractor you do not want to use the model "G" piston. They are best for standard stoke applications and no good for any stroked application that are going to amount to anything. The "G" piston has too long compression distance for stroker applications. If you are going to stroke the tractor to gain any worth while advantage you will need shorter compression distance on your pistons and also want to use a longer connecting rod to maximize your combinations of alterations. I have seen many people want to stroke there model "A" after boring there power-blocks to 6.125 dimensions to find that the bore size would require a custom made piston to meet there needs/application when stroking. If they would of bored the block for an off the shelf air plane piston measured (approximately) 6.120 the saving on the piston cost would of went along way on the stroking expense. I think the piston you will want is used in a Pratt Whitney air plane engine, this piston will work well with a stroker crank and can be found used allot cheaper than having custom pistons made. If you are not ever going to stroke it go with the standard bore "G" piston. If you are going to ever stroke it save yourself some money and headache and find some airplane pistons and do it right once the first time. Good Luck, DW

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New70

07-10-2007 08:35:49




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 Re: Stroking An A John Deere- in reply to WTW, 07-10-2007 08:15:34  
We just put G pistons in a 70 gasser, with a stock crank, and they had to be cut back a little to make the compression height just below the top of the block. I know the 70 is a shorter block than an A, but cant be much more to accomidate alot of stroke. Would be a high compression engine, maybe too high.



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