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Discussion Forum

Re: M Overbore to 450 Displacement

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Red Rider

02-08-2002 20:00:09

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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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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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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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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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