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Tractor Pulling Discussion Forum

Re: m farmall

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north puller

01-17-2013 14:38:18

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Where do you pull? What type of class or division? How much power are you thinking you need? What are the rules: stock block? Stock head? RPMs? Fuel?

Are we talkin farm stock or Div 4 or the county fair?

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01-18-2013 17:11:28

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 Re: m farmall in reply to north puller, 01-17-2013 14:38:18  
Lamonte, Sweet Springs,Marshall MO I pull my m in division 2 stock class. I was thinking 60 to 70 hp at of it. we can have stock block we can do thing in side but we need keep it stock look we run about 2500 rpms run gas only.

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north puller

01-19-2013 04:23:21

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 Re: m farmall in reply to 3farmall, 01-18-2013 17:11:28  
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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