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Tractor Pulling Discussion Forum

jd a block

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jons

12-30-2004 20:43:08




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has anyone ever bored and sleeved a stock jd A block out to 6 1/8




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Earl S.

12-31-2004 12:12:53




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 Re: jd a block in reply to jons, 12-30-2004 20:43:08  
Yes you can . Spark plug holes was our biggest problem. Sleeved them ,brazed them. you need to extend block head studs to rear of block. because you are taking strength out of the deck when sleeving.Even when furnace welding sleeves in.Take others advise of Power block.Or get yourself a "G".Have fun .Earl



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Paul Winter

12-31-2004 06:19:26




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 Re: jd a block in reply to jons, 12-30-2004 20:43:08  
simple answer .Yes. a
guy was advertizing several years ago put G pistons in an A block. Green magazine i think Paul



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Drew

12-30-2004 21:29:14




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 Re: jd a block in reply to jons, 12-30-2004 20:43:08  
Do your rules allow you to use a power block?? If so, you would STILL be time and money ahead to get a power block than to sleeve a stock block even with the high cost of the power block. Yes, you can cut the stock cylinders out completely and furnace braze new sleeves in, but expensive is an understatement.



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jons

12-30-2004 21:33:59




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 Re: jd a block in reply to Drew, 12-30-2004 21:29:14  
just looking for ideas. anyone know where i can find a 6-1 power block that's not cracked and doesn't leak, getting hard to find. thanks



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BushogPapa

12-30-2004 21:06:59




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 Re: jd a block in reply to jons, 12-30-2004 20:43:08  
The "Power Block" for the "A" had a bore of 6"..and I have heard of them being bored to 6 1/8"

6" made it larger than the bore of a Gas "70"..!!

Ron..



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jons

12-30-2004 21:22:59




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 Re: jd a block in reply to BushogPapa, 12-30-2004 21:06:59  
i'm not talking about power blocks. i mean boring the orginal sleeve all the way out of the stock block and installing 6 1/8 sleevs in place of the stock sleeve.



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buickanddeere

12-31-2004 01:24:41




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 Re: jd a block in reply to jons, 12-30-2004 21:22:59  
While the question has been likely asked before. Is there any way to bore the stock block and install 6-1/8 or larger sleeves via brazing or silver solder? A ring would have to be nickel welded inside the front of each sleeve to provide head gasket sealing surface.



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deere puller

12-31-2004 05:06:17




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 Re: jd a block in reply to buickanddeere, 12-31-2004 01:24:41  
I don't personally know anyone who has gone that big with an A block, but I've heard of it being done. You can usually bore the stock block out just as big as the power block, the power block just starts you out with a bigger bore. I believe you can actually bore it out to about 6 1/2 or 6 3/4", you just have to furnace braze the sleeves in like Drew mentioned.



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buickanddeere

12-31-2004 17:07:56




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 Re: jd a block in reply to deere puller, 12-31-2004 05:06:17  
I've heard tell of furnace brazing but just exactly how is it done?



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deere puller

12-31-2004 18:22:33




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 Re: jd a block in reply to buickanddeere, 12-31-2004 17:07:56  
not 100% sure myself as I've never had that done to any of mine, but I believe they heat the block to around 1200 degrees, pull it out and weld the sleeves up, then put it back in and cool it about 100 degrees per hour.



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