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John Deere Tractors Discussion Forum
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'46 A, a few more horseys?

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BLinWMi

01-13-2007 21:57:37




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Curious if anybody knows, can a guy shave some flesh off a head or block of a '46 A to raise the compression. I have an A that cracked a piston in half one day cutting wood with it. I was in college at State when it happened, so dad took it apart, put a new piston in it and reassembled. Only problem is, he put straight water in it and forgot about it. So when I went to start it up a bit later, a nice chunk of head and block lay on the barn floor under it. I have since bought a block and pistons and had an extra head around here. I don't want to bore it and go nuts looking for power but am wondering if I could raise the compression a bit safely on this tractor. I have the fancy electronic distributor from Dennys and had the tractor tuned up pretty decent, was making 39 horse on the dyno. Wondered if anyone knew if it was feasible to shave a few thousandths to gain some grunt? Brian

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Rob Hartman

01-15-2007 02:32:55




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 Re: '46 A, a few more horseys? in reply to BLinWMi, 01-13-2007 21:57:37  
Shave an 1/8 inch off the block. Use a late A head. If the head stud pattern is the same put a 60 head and dual induction on it. That will bring it to life. If it's a slant dash, electric start I'd be converting it to 12V if you havn't already. Goodluck with your project. I have a 1941 slantdash with a Power Block that will pull 62HP on the dyno. It's not tuned in yet, just got it together.



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Mike M

01-14-2007 15:37:38




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 Re: '46 A, a few more horseys? in reply to BLinWMi, 01-13-2007 21:57:37  
Couldn't you just put some late A gas pistons in it ?



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Mike n Mo

01-14-2007 08:26:12




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 Re: '46 A, a few more horseys? in reply to BLinWMi, 01-13-2007 21:57:37  
Shaving the head 10 or 20 thou won't gain you much as far as compression. If you are replacing the head anyway and want more compression, put a late A head on it. It'll have about 6cu in less volume in the combustion chamber. Look for a A3367R or A4226R casting number. Mike



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