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Tractor Pulling Discussion Forum

max bore farmall H

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farmallmanj

02-13-2005 19:06:22




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Looking to go with a big bore on my H and curious as to how to do it best. Thinking of taking sleeve out and boring water jacket but dont want to leave step in the top of the block and lose compression. will a sleeve and piston from an 806 work and how big of a bore is needed for sleeve to fit?




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Chads

02-14-2005 09:45:11




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 Re: max bore farmall H in reply to farmallmanj, 02-13-2005 19:06:22  
You can bore the H block out to the 806 bore and not have to put in aftermarket sleeves, it will run on the block and still have about .145 thick, in the thin spots. Have the block checked for cracks before boring it, best insurance. You will have to run a stroker to run the 806 pistons, just a bit of info,, you have a wide selection of pistons to choose from that have the same compression height as the 806 piston,,, ranging from 3-9/16 bore, up to 3-13/16 bore, use pistons from any IH 6 cyl engine with a stroker. Minumum stroke to use the 6 cyl pistons is 5 inches. and can be used up to 5-3/4 stroke. OR, use a 300-350 block, and go to 4 inch bore. Then you have an option,,,,, no stroker,,, and use Massey 44 pistons (C-260 4 cyl gas) they are the same compression height as the H, you will have to bore the H rod to adapt the large wrist pin to the H rod. On the H blocks,, there will be no ring at the top at 3-13/16 bore, there will be on the 300-350 blocks,,, the 300-350 blocks have a bre size of 3-3/4 when you remove the sleeves,,,,, ,,, and there is an IH 6 cyl piston, that is 3-3/4 from the IH 706 C-291 gas. Hope this helps a bit,,, what is your plans,, to stroke it? or not? ChadS

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Chads

02-14-2005 09:45:02




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 Re: max bore farmall H in reply to farmallmanj, 02-13-2005 19:06:22  
You can bore the H block out to the 806 bore and not have to put in aftermarket sleeves, it will run on the block and still have about .145 thick, in the thin spots. Have the block checked for cracks before boring it, best insurance. You will have to run a stroker to run the 806 pistons, just a bit of info,, you have a wide selection of pistons to choose from that have the same compression height as the 806 piston,,, ranging from 3-9/16 bore, up to 3-13/16 bore, use pistons from any IH 6 cyl engine with a stroker. Minumum stroke to use the 6 cyl pistons is 5 inches. and can be used up to 5-3/4 stroke. OR, use a 300-350 block, and go to 4 inch bore. Then you have an option,,,,, no stroker,,, and use Massey 44 pistons (C-260 4 cyl gas) they are the same compression height as the H, you will have to bore the H rod to adapt the large wrist pin to the H rod. On the H blocks,, there will be no ring at the top at 3-13/16 bore, there will be on the 300-350 blocks,,, the 300-350 blocks have a bre size of 3-3/4 when you remove the sleeves,,,,, ,,, and there is an IH 6 cyl piston, that is 3-3/4 from the IH 706 C-291 gas. Hope this helps a bit,,, what is your plans,, to stroke it? or not? ChadS

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Chads

02-14-2005 09:42:21




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 Re: max bore farmall H in reply to farmallmanj, 02-13-2005 19:06:22  
You can bore the H block out to the 806 bore and not have to put in aftermarket sleeves, it will run on the block and still have about .145 thick, in the thin spots. Have the block checked for cracks before boring it, best insurance. You will have to run a stroker to run the 806 pistons, just a bit of info,, you have a wide selection of pistons to choose from that have the same compression height as the 806 piston,,, ranging from 3-9/16 bore, up to 3-13/16 bore, use pistons from any IH 6 cyl engine with a stroker. Minumum stroke to use the 6 cyl pistons is 5 inches. and can be used up to 5-3/4 stroke. OR, use a 300-350 block, and go to 4 inch bore. Then you have an option,,,,, no stroker,,, and use Massey 44 pistons (C-260 4 cyl gas) they are the same compression height as the H, you will have to bore the H rod to adapt the large wrist pin to the H rod. On the H blocks,, there will be no ring at the top at 3-13/16 bore, there will be on the 300-350 blocks,,, the 300-350 blocks have a bre size of 3-3/4 when you remove the sleeves,,,,, ,,, and there is an IH 6 cyl piston, that is 3-3/4 from the IH 706 C-291 gas. Hope this helps a bit,,, what is your plans,, to stroke it? or not? ChadS

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farmallmanj

02-15-2005 10:00:07




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 Re: max bore farmall H in reply to Chads, 02-14-2005 09:42:21  
I am going to stroke it. I'm looking now at how far I want to go. Once I find the right piston rod combo I am going to kinda let that decide how far to go. I am going to stick with the stock 8 inch rod thats in it. I dont want the hassle of making new rods up. I have been looking at some chevy pistons. they have a low pin height that will let me go with a stroke in the 1 1/2 inch range.



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ChadS

02-15-2005 12:28:13




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 Re: max bore farmall H in reply to farmallmanj, 02-15-2005 10:00:07  
I hear ya on that. I can tell you from experience, that at 1 inch stroke, Long as the block is good, they are bullet proof. At 5-1/2 stroke should be pretty good too, 5-3/4 you better think about replacing blocks every 5-7 seasons at the big bore. It will shake them apart in time, try to keep the piston skirt long enough to hold it very steady in the bore, Chevy pistons have busted the skirts off before at 5.5 stroke, after 3 seasons of pulling. 5.5 stroke with a 706 3-3/4 bore piston, 8043DD casting cyl head, 350 cam is quite an engine, makes good power. ChadS

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farmallmanj

02-15-2005 15:30:07




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 Re: max bore farmall H in reply to ChadS, 02-15-2005 12:28:13  
what is the pin height on an 806 piston? I am planning on using a 5 1/2 stroke with the largest practical bore I can. I really dont want to get into modifying rods so I am looking for a pin height that will work with the stock rod and 5 1/2 stroke yet still give me good compression. Also is there any diference between the 560 lifter and the H lifter. I have been told that the 560 lifter has a larger base which will alter my cam timing somewhat. Any truth to that? One concern that I have with going to the bigger cubes is feeding enough air to the motor. Seems to me the cam specs will be way to small seeing as how they were designed for the smaller motor. I think the cam numbers from a 450 would be a better place to start even though a 450 cam obviously wont fit in the block.

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wildman

02-16-2005 09:04:24




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 Re: max bore farmall H in reply to farmallmanj, 02-15-2005 15:30:07  
I might have a 4.160 block for sale cleared for up to 6"stroke.Chads has my number.



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Sorry bout the triple pos

02-14-2005 09:47:47




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 Re: max bore farmall H in reply to Chads, 02-14-2005 09:42:21  
Darn computer ran slow, got impatient,,, ChadS



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m-boy

02-14-2005 04:29:55




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 Re: max bore farmall H in reply to farmallmanj, 02-13-2005 19:06:22  
i just did it to a m and i took out the old sleeves and cut the ring off the top and locktited back in and filed it down so they could bore right through it without that step in it. therefore i did not loose any comp. i did have the deck ran over to make it all true again.



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