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M Overbore to 450 Displacement

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lcbateman

02-08-2002 07:06:26




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Just wanted to get some thoughts on this senerio. Has anyone bored out an M block to allow placement of 450 sleeves and pistons? Would you gain any real power unless you also replaced the M head with a 450 head or a least did some serious porting on the original head? What other things would have to be considered to make this kind of change to a stock M engine? In the end, would it even be worth the time, money and effort for non-competitive tractor uses?

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Red Rider

02-08-2002 20:00:09




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 Re: M Overbore to 450 Displacement in reply to lcbateman, 02-08-2002 07:06:26  
When I was a kid plowing with a straight M behind my Dad on a Super M, the old M just wouldn't keep up. We overhauled it with a firecrater super kit IH called it. The kit was 4" firecrater piston and sleeves. The firecrater pistons raised the compression a little. Anyway It did make a big difference. It still did't have the power that the Super M did but I would take the lead plowing because the 4th in the M was a little faster than the 3rd in the Super M. To put the 4.125 piston and sleeve set in a plan M you would have to bore the block. To get the same HP out of your M as a 450 naturally you would have to have the same head, Cam, intake/exhaust and carberator. I have a Super M that I have the 4.125 high altitude firecrater pistons in and it dynos at 61 HP. It will actually out pull my 450.

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lcbateman

02-10-2002 07:50:15




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 Re: Re: M Overbore to 450 Displacement in reply to Red Rider, 02-08-2002 20:00:09  
Thanks for the info. I am thinking that I will stick with the 4" bore and FireCrater pistons. I am planning on porting and polishing the head, maybe milling the head down a little and maybe a little carb jet work. I am really just looking for about 50 peak HP, 35 avgerage HP for generator duty.



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jakee

02-08-2002 20:25:11




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 Re: Re: M Overbore to 450 Displacement in reply to Red Rider, 02-08-2002 20:00:09  
most of the 248 wen bored for the 4.125 kit --the boring bar goes threw to the water jacket at the bottom.



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lcbateman

02-10-2002 07:51:15




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 Re: Re: Re: M Overbore to 450 Displacement in reply to jakee, 02-08-2002 20:25:11  
I was afraid of that. I think I will stick with the 4" bore and FireCraters.



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randy hall

02-08-2002 16:00:54




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 Re: M Overbore to 450 Displacement in reply to lcbateman, 02-08-2002 07:06:26  
the m&w chart says 53.8 hp. with 4" and 55.2 hp. with 4.125. not much for all the trouble. we have done serveral m's like this. if you are interested i could send you a copy of the m&w paper showing the dimensions to bore an m block for 4.125 sleeves.



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lcbateman

02-10-2002 07:52:10




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 Re: Re: M Overbore to 450 Displacement in reply to randy hall, 02-08-2002 16:00:54  
I agree, sounds like lots of work for little gain. Thanks for your input!



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Steven@nd

02-08-2002 18:04:32




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 Re: Re: M Overbore to 450 Displacement in reply to randy hall, 02-08-2002 16:00:54  
You should note, however, that the 450 ran fewer RPM's than the Super M's.

Steven



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randy hall

02-08-2002 18:30:43




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 Re: Re: Re: M Overbore to 450 Displacement in reply to Steven@nd, 02-08-2002 18:04:32  
my books and the tractor tags say for m 1595 high idle ,1450 rated speed. super m 1600 high idle 1450 rated speed. 450 1600 high idle, 1450 rated speed.



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Flyin Farmall

02-08-2002 18:00:17




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 Re: Re: M Overbore to 450 Displacement in reply to randy hall, 02-08-2002 16:00:54  
I'd love to see that!!e-mail me,knorton_wriske@yahoo.com



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