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Tractor Pulling Discussion Forum

J D G head work

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mike melvin

09-16-2006 14:55:49




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Wondering what could be done to a G head. The block was bored 125 over and 7 5/8 stroke. Had the cam done by Roberts. What valves to use in the head and other stuff done to the head.Any suggestions would be greatly appreciated.




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murphster

09-17-2006 05:59:27




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 Re: J D G head work in reply to mike melvin, 09-16-2006 14:55:49  
there's really not a lot to be gained. you're just 58 cubic inches over stock. to maintain torque you don't want to go crazy, maybe just a little smoothing out of rough and sharp edges. I wouldn't put larger valves in.



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B-maniac

09-17-2006 13:16:52




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 Re: J D G head work in reply to murphster, 09-17-2006 05:59:27  
You have 58 ci more to fill than before.Can we assume that the induction system on an ole G was "over designed" with future mods. in mind??? Also, any slowing of inlet flow velocity caused by "opening" things up a little has allready been more than allowed for by the large increase in stroke.Longer stroke greatly increases the intake and exhaust velocity. Put the G on a good hard pull,and after 15 min,take a plug reading.Use this to get your fuel mixture spot on.Without spending a lot of "experimental" money,I would get your carb,governor and spark dialed in perfect. Rather than the expense of larger valves and cams to fill the extra cubes,heres what I would do.Check the piston to valve clearance. There should be way plenty.(use modeling clay on top of piston and roll engine over 4 revolutions,measure thickness).Have a GOOD machinest alter your rocker arms ratio to open the valves farther (even .050 will pass a lot more air)We are talking a 2 cyl tractor here,that won't see 1500 rpm.This little mod makes more sense than spending the money on cams and larger valves to do the same thing. Stick to the basics and use common sense,that's the secret to getting torque out of these ole 2 cyl's. A little extra compression is another by-product of stroking an engine. Check your new compression ratio.If it is getting up in the 9:1 or higher range,then you can also now take advantage of the higher octane,longer and more powerfull burn of a 94-96 octane fuel. It all adds up! Torque +

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