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Tractor Pulling Discussion Forum

John Deere G Power

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11-19-2005 19:05:29

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I have a '51 G with a 6.5 bore x 7.5 stroke, msd ignition, johnson manifold, ported head with big valves. Approximately, how much power will this tractor have?

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11-19-2005 19:28:18

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 Re: John Deere G Power in reply to GO DEERE, 11-19-2005 19:05:29  
Aluminum pistons. Will have a cam out of a 720.

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11-23-2005 07:38:27

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 Re: John Deere G Power in reply to GO DEERE, 11-19-2005 19:28:18  
Piston material doesn't mean anything. The compression-ratio does. A stock "G" in good tune is good for about 40 horsepower give or take. One with hi-comp pistons and a good cold manifold 50-55. With a Power-Block, they were supposed to make closer to 60. Yours "should" be good for 75 easy, I would think. I say "should" because it's not just a matter of throwing the "big" parts at it, it's a matter of getting everything to work together properly and proper tuning. I'd be looking into one of the "performance" cam grinds available from Robert's, etc. instead of a stock 720 camshaft. After all, a 720 is SMALLER than a stock "G", and you've got a bunch more cubes than a stock "G" there.

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