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Tractor Pulling Discussion Forum

John Deere G head

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PlowinG

03-11-2006 19:29:37




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Hey guys, turned to the pullin' board for this one, even though I'm not a puller! I'm going to have the head redone on my 47GM, It has the cyclone intake head on it. Is it possible to put bigger valves in this thing while I have it apart? If so, what can I do without a whole bunch of work. I just use it around the farm, but it needs a bit more "umph" in the hard clay we have around here if it hasn't been plowed in a while. I also intend on putting aluminum pistons in it. Without goin' crazy guys, I have to use this thing!

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G/MAN

03-12-2006 14:24:56




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 Re: John Deere G head in reply to PlowinG, 03-11-2006 19:29:37  
I've heard that a good 3-angle valve job, mild porting and polishing, gasket-matching the manifolds to the head, etc. are the best ways to go. If you're going to work the old girl often, you won't want sky-high compression and the possibility of knocking under heavy continuous load, so I wouldn't worry about milling a bunch off the head to gain compression. I'd make sure the block and head decks were good and flat and stay with that. You might also want to consider a camshaft regrind, as I've heard that the stock grinds were pretty inaccurate. You might want to call Robert's Carburetor Repair, as he'll talk cam-grinding with you. I believe they offer several different grinds, and you'll likely want a low-end torque grind. Roller rockers from Murphy's might also gain you a few ponies, and they're not all that expensive. They look like pretty good units in the pictures. If you don't already have one, you might want to look for a "cold" intake manifold - one designed for burning gasoline. You can find anything from the Deere F1074Rs that they put out to convert "G"s to gasoline to Johnsons, Heislers and so forth. I think there are some new ones being made today, also. Electronic ignition should wake it up some and improve starting and throttle response, also. With all of the above and a rebore and new aluminum pistons, you should make 50-55 horsepower pretty easy, or a solid 20-25% over stock horsepower. That should give the old "G" enough bark to jerk that plow around...

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