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Farmall & IHC Tractors Discussion Forum
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h motor rebuild

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Howard Junkin

01-29-2008 07:22:04




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can you bore out a h block and put 300 or 350 pistons and sleves in?

thanks howard




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N.D. Farmall H Puller

01-29-2008 07:52:04




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 Re: h motor rebuild in reply to Howard Junkin, 01-29-2008 07:22:04  
I bored mine out to take 3 9/16 in pistons



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ChadS

01-29-2008 07:49:37




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 Re: h motor rebuild in reply to Howard Junkin, 01-29-2008 07:22:04  
Yes. Use the 350 head gasket. Most kits come with firecrater pistons for the 175, if your going to run the H gas head, watch your piston to head clearence. On the manifold side of the compression chamber, the later model cyl heads had a "Slant" casted into the side of the chamber, which made room for the firecrater piston dome. H heads, have to have this slant cut into them so the pistons dont hit the head. Hope this helps, ChadS ChadS3@hotmail.com

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L.C.Gray

01-29-2008 16:35:42




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 Re: h motor rebuild in reply to ChadS, 01-29-2008 07:49:37  
Perzactly right. I had to trim my H head to clear the firecraters on my 300 engine.



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RustyFarmall

01-29-2008 07:48:19




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 Re: h motor rebuild in reply to Howard Junkin, 01-29-2008 07:22:04  
The way I understand it is that some of the H blocks have enough meat in them to allow for over-boring, and some are thin enough that over-boring by that much will basically make a good paper weight out of the block. Don't know how to tell which is which.



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ChadS

01-29-2008 08:18:24




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 Re: h motor rebuild in reply to RustyFarmall, 01-29-2008 07:48:19  
Ive seen the older blocks be that way. 39-42 blocks, you were pushing your luck at 3-3/4". Seemed like from 43 and newer they had more meat in em. M blocks,,, the older blocks, bad, newer blocks, good. Chad



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RustyFarmall

01-29-2008 12:26:28




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 Re: h motor rebuild in reply to ChadS, 01-29-2008 08:18:24  
That must be what I was thinkin'.



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