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Tractor Pulling Discussion Forum

Re: m farmall

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north puller

01-19-2013 04:23:21

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Depending on the track and the speed, 70hp might do it, or might not.

You can have your block bored to accept 4.25" pistons. Makes 298ci with stock stroke. Along with carb work, cam work, and head work, that should get you 65-70hp.

If you are limited to pump gas (93 octane) then you had better stop at about 9:1 for compression. If you are allowed better fuel, 11 or 12 compression works a lot better.

If you want to turn 2500rpm you will need considerable carb work and a custom cam to match that engine speed. Many people will tell you that your motor will live a lot longer if you stay at 2000rpm.

If you are allowed, a 450 head will help too.

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01-19-2013 08:29:56

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 Re: m farmall in reply to north puller, 01-19-2013 04:23:21  
I found a 450 head and a set of 4" M&w pistons do think could get up to 50 hp? And is there a difference in a m card and super m carb?

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north puller

01-19-2013 19:11:36

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 Re: m farmall in reply to 3farmall, 01-19-2013 08:29:56  
I would guess that 4" M&W's and a 450 gas head would give you 50-55hp.

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