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Tractor Pulling Discussion Forum

Head Shaving

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Mel

01-02-2005 03:11:11




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Need advise on how much to mill a head on a John Deere G the crank was offset ground gaining 3/8" stroke and bored 125 over. Any input would be greatly appreciated.




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BushogPapa

01-02-2005 08:42:03




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 Re: Head Shaving in reply to Mel, 01-02-2005 03:11:11  
Fellas will want to know what model "G" you have and what head you are using... How much work are you doing to the chambers, valves and ports..?? Breathing is the KEY to Horse Power..an engine is a pump, actually....!! Your 3/8" increase in stroke will increase compression some...and what compression-Height are the pistons you are going to use..?? Enjoy..that is a BIG Horse you have..!! Ron..



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JDGnut

01-03-2005 19:23:42




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 Re: Head Shaving in reply to BushogPapa, 01-02-2005 08:42:03  
You can still go .250 off the head and .100 off the block.. or a little more depending on the condition of your block... (I usually stop milling on the block before it gets to the cutouts in the deck for the sparkplugs.. if you want to go more, you can weld the block and keep milling.. or even use JB weld.) I am guessing you are using the high compression AL pistons.. you will have to run racing fuel or even AV... You will be happy with the HP for what you will have in this set up... Good Luck
JDGnut

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