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JD G Power Block

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trent

07-06-2000 04:47:33

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Hi,
Could someone tell me the diff.between a std.
block and a power block and where did they come from and where can you get one.

Thanks Trent

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WTW

07-06-2000 11:23:31

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Re: JD G Power Block in reply to trent, 07-06-2000 04:47:33

Standard bore on a "G" was 6.125, Powerblock bore was 6.50. Blocks were sold through Tractor Supply stores back in the mid and late 50's. Getting real hard to find and very high dollar. I have seen several bring $1500.00, Can't tell you where you can find one for that price either. The guy in South Carolina is making puller blocks for "G's" and taking them up to 7.50. You will have your work cut out to make this happen and empty checking account when finished. To get this size of bore in the tractor you will have to sacrifice the old girl for a puller only because you really have to slaughter it to make it fit and it will also require a thick spacer plate too. A Powerblock is the way to go if you could find one, they can be taken up to 7 inch by resleeving and still have some integrity left in them. I have had several Powerblocks bored to 6.625 using the original sleeves without any problems. The other expense when messing with these Powerblocks are having custom pistons made for them as they were never were intended to be bored and there never were oversize pistons ever available. You can have pistons made for them at an average cost of $750.00 to 1200.00 a set depending on what kind of things you want to do. Not hard to get $2500.00 To $3000.00 just in the cylinders. Then we can talk about the stroker crank but that is another subject. Good Luck, Dave W.

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Justin

07-18-2000 18:36:56

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Re: Re: JD G Power Block in reply to WTW, 07-06-2000 11:23:31

The Power Block can actually be taken to a 7 3/8" bore, just like any other G block. There is no real advantage by using a Power Block. You might be able to get a little more compression out of it, but you can get all you need out of a stock block when you get to building one for pulling. The Power Block is also a pain because you had to put the pistons in from the back of the block. With the stock block pull the head and they'll come out of the top. If you were building one for pulling it wouldn't be worth the time spent searching for one or money spent buying one to go that route. The best block to use is the unstyle G block, it is one inch longer than the style block therefore giving you an extra inch to use for rod length or for lowering the wrist pin so it isn't all the way up in the rings.

Justin

Warren County Antique Tractor Association

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