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Tractor Pulling Discussion Forum

JD G power block

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Robert

08-04-2004 09:14:55




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i've got a '48 john deere G, and i was wondering if i put a tractor supply power block with a 6 1/2 inch bore and a flat head from an unstyled G if that combo will work? or would the compression be to high? would it be possible to stroke it a 1/4 inch?




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WTW

08-04-2004 09:24:46




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 Re: JD G power block in reply to Robert, 08-04-2004 09:14:55  
Robert, The stock (Power-block) pistons with the flat head will yield too much compression. You could cut down the piston height to make it work. I got this same flat head and Power-block in a "G" with a 10" stroke but this kind of cube requires different rods and pistons along with some major clearance work. The sky is the limit if you wallet will stand it. Good Luck Dave W.



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Robert

08-04-2004 09:36:26




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 Re: JD G power block in reply to WTW, 08-04-2004 09:24:46  
would it be possible to put 2 or 3 head gaskets on to lower the compression?



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Ironman

08-04-2004 11:19:20




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 Re: JD G power block in reply to Robert, 08-04-2004 09:36:26  
Unless you already have the power block, I'm not sure you would gain much over a factory block for the price you'll pay ($1200+ for power block). You can bore a factory block out to 6 3/8" without sleeving (I've heard of some going out to 6.425" with no sleeve), so you're not far behind a power block right there and it won't give you too much compression with the flat head.



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Drew

08-04-2004 10:13:02




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 Re: JD G power block in reply to Robert, 08-04-2004 09:36:26  
Probably a better solution than that would be to put extra gaskets in between the block and the crankcase. It would be a lot cheaper too!! Beer boxes and an exacto knife work well for this. I don't know if a few gaskets would get rid of enough compression though. If not, shims can be made of .125 steel to drop the comp. a lot in a hurry.



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