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Tractor Pulling Discussion Forum

Re: farmall h build

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Tim Yates

12-13-2012 14:42:31

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Take out the sleeves and run custom pistons at 3.75" bore. Stroke to 5.5" or 5.75". You can use stock rods and shold come up to approximately 80 to 85 horse power and be reliable. Shoot for 12.5 to 13 to 1 compression. Cam ground by Bullet , good 300/350 head .

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jess r

12-13-2012 17:31:57

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 Re: farmall h build in reply to Tim Yates, 12-13-2012 14:42:31  
Thanks for the info is there alot of block grinding to fit the 5.5 stroked crank thanks again.

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12-14-2012 03:08:48

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 Re: farmall h build in reply to jess r, 12-13-2012 17:31:57  
You can take quite a bit off the stock rod for clearance so you don"t need to cut so far into the oil galley. Also cut flats in the cam so you keep it strong. 1/2" diameter on the cam is pretty small.

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12-13-2012 19:50:58

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 Re: farmall h build in reply to jess r, 12-13-2012 17:31:57  
Yes. At 5.125 you have to take the webbing out. Grind the neck out of the oil galley just shy of breaking thru, and cut the cam down to 1/2" thick. With an untouched stock.rod. not to mention small.areas on the pan rail.

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12-14-2012 05:34:20

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 Re: farmall h build in reply to tuckerMAX, 12-13-2012 19:50:58  
if you cut the rods just right, use a 350 IH rod journal, not a H journal, you can do 5.75 with only notching the cam and the bottom of the cyl walls, and not touch the webbing, or oil gallery at all. good luck.

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12-14-2012 09:01:52

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 Re: farmall h build in reply to ss409, 12-14-2012 05:34:20  
ss409 is right, Youd be better off to put some effort in the rods.

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Tim Yates

12-13-2012 14:44:58

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 Re: farmall h build in reply to Tim Yates, 12-13-2012 14:42:31  
You can run a good set of custom pistons with a good dome to raise the compression and stock stroke with a good 300 head will get you over 50 hp.

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