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Tractor Pulling Discussion Forum

John Deere 70 Power Blocks

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John179

08-03-2006 12:35:03




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I am in the process of turning my stock 70 into a hardcore puller. And i am looking for a power block to maximize my cubes with a stroker crank. I figure if i am going to spend money it would be cheaper to do it all at once then multiple times. I already have a shop in mind for the crank and cam jobs. and I found a shop to make custom pistons.




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ESD

08-06-2006 12:12:49




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 Re: John Deere 70 Power Blocks in reply to John179, 08-03-2006 12:35:03  
If you're going to spend the money on a G or 70 power block, I wouldn't have pistons, not sleeves, any smaller than 7 1/2. If you're spending the money resleeving, why only go to 7, GO BIG OR GO HOME!



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mattf

08-03-2006 19:18:42




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 Re: John Deere 70 Power Blocks in reply to John179, 08-03-2006 12:35:03  
I have one bored to 6.750 I'll sell. email me. Thanks MATT



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John179

08-04-2006 19:54:49




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 Re: John Deere 70 Power Blocks in reply to mattf, 08-03-2006 19:18:42  
I am not sure if you got my e-mail but if you could give me a call at 763-682-4665 or I could call you if you would give me your number.



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deere puller man

08-03-2006 14:00:48




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 Re: John Deere 70 Power Blocks in reply to John179, 08-03-2006 12:35:03  
If you're looking to go big enough that you're boring and sleeving out the Power Block bigger, just skip buying a power block. The stock block will bore and sleeve out just as big and you won't have the $1200+ invested in buying a block when the factory one will work fine.



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John179

08-03-2006 20:27:31




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 Re: John Deere 70 Power Blocks in reply to deere puller man, 08-03-2006 14:00:48  
So what your saying is that i can bore my stock block out to lets say 6.750 and put that diam of piston in that cylinder. Because I thought the biggest piston you could put in a stock block was 6" .125 over stock which was (5 7/8).



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deere puller man

08-05-2006 13:09:41




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 Re: John Deere 70 Power Blocks in reply to John179, 08-03-2006 20:27:31  
6" is as big as you can bore it without sleeving it. Sleeve it and you can go as big as the block will go.



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John179

08-05-2006 17:21:34




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 Re: John Deere 70 Power Blocks in reply to deere puller man, 08-05-2006 13:09:41  
So what your saying is that I can bore my stock block out to say 7.50 and sleeve it so a 7" piston will fit and that would be ok as well. And I have also heard of cementing the block for aditional strength. do you think that would be a good idea if i never want to farm with it ever again.



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deere puller man

08-05-2006 22:01:29




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 Re: John Deere 70 Power Blocks in reply to John179, 08-05-2006 17:21:34  
Right...I've forgotten how thick of a sleeve you need to run, but it works pretty much like you said. If you go that big there's not much left to cement since you've pretty much bored all the way through the water jackets, but it's a good idea to do what you can because it just helps seal the sleeves up and strengthen everything.



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buickanddeere

08-06-2006 05:34:00




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 Re: John Deere 70 Power Blocks in reply to deere puller man, 08-05-2006 22:01:29  
How far can a 70 block be bored and sleeved while keeping water around most of the sleeve? Sleeve thickness should be 3/16" and 1/4" is better. 1/8" is so thin that the cylinder walls flex and loose decent ring seal. The too thin walls also let too much heat through into the coolant. Of course this is where a sleeve is supported only at the deck and base of block.



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JDBert

08-04-2006 06:23:38




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 Re: John Deere 70 Power Blocks in reply to John179, 08-03-2006 20:27:31  
You can go to .250 over- But it depends on your block condition- it might work just bored if not you'll have to sleeve it. I'm pretty sure you can go to 7" on a powerblock-



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Drew

08-04-2006 10:57:41




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 Re: John Deere 70 Power Blocks in reply to JDBert, 08-04-2006 06:23:38  
I have in my notes that a 7-1 G power block is 7.062 OD on the sleeves, and I remember that a 7-2 70 PB has thinner sleeves(cant find a note for the OD dimension for the 7-2), so I wouldnt push it any farther than +.125 than absolutly necessary.



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Drew

08-04-2006 00:03:02




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 Re: John Deere 70 Power Blocks in reply to John179, 08-03-2006 20:27:31  
You are right, the biggest you can bore a stock block, in stock fashion is +.125". BUUUUT, you can have that stock block modified and have sleeves put in to take a 7.000" bore or larger. All depends on how much you want to spend and how hard you want to work to make it fit.

The $1200++ you will spend on buying a 7-2 block will pay to have your stock block sleeved bigger than you can bore the 7-2 block, and you get more ci to boot.

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Miller49G

08-04-2006 07:33:19




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 Re: John Deere 70 Power Blocks in reply to Drew, 08-04-2006 00:03:02  
Were is a good shop to have this done to a stock block.



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Drew

08-04-2006 17:31:26




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 Re: John Deere 70 Power Blocks in reply to Miller49G, 08-04-2006 07:33:19  
You've got mail.....



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Blake G

08-03-2006 21:21:08




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 Re: John Deere 70 Power Blocks in reply to John179, 08-03-2006 20:27:31  
forget the jd, get a real tractor...a oliver!!!



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