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Farmall & IHC Tractors Discussion Forum
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Stan(VA) pistons

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Dale in ar.

01-06-2007 18:43:52




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Stan, in your reply about me boring a 123 sleeve and using a bigger piston.You replied that using pistons from a 135 would work better,have you done this before or know the procedures of doing it??I have been giving this some thought but wondered how the clearence would be between the stroke of the 123 and the deck height of the 135 piston.I have the 135 head and that I am going to use which ever way I go(bigger valves and smaller combustion chamber).

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Stan(VA).

01-06-2007 21:39:30




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 Re: Stan(VA) pistons in reply to Dale in ar., 01-06-2007 18:43:52  
Dale,
No I havn't done that yet. I was trying to get you a 3-1/4 piston with the firecrater head, and AFAIK Farmall only went to a 3-3/16 overbore kit from the factory for the 354898R block. My assumptions were that since the C135 is just 0.062 longer stroke and had a 0.060 smaller pin, you could offset bore the pin hole and get right back where you wanted to be and you would get the firecrater head design (vs the Tisco aftermarket pistons for the 3-1/4 overbore kit which are ~0.100 short on comp height and just have the step head design but the right pin bore). I wouldn't normally recommend that to anyone else because of cost (buying the original sleeve kit + a C135 kit + the machining) but you were looking for ideas.

Anyway... I just did some checking on a spare C135 P&S set I have here and found that I was wrong (my appologies). They dropped the compression height at least 0.100 from the C123's which gets you right back to the Tisco pistons (as far as height). Quickly eyeballing it the C135 piston seems to match the C153 comp height (due to stroke, the C153 would need about 0.125 shorter height). They may have changed the deck height on the C135 block, or they might have just been trying to save money and use a single mold to cover both piston blanks. That's all just a guess until I see one put together with the crank. I have a spare block and sleeve kit, but no extra 135 crank at the moment. I know the aftermarket kits for 3-1/4 don't come to the top of the block, like the 3-1/8 kits do.
Realizing the comp height difference, I'd just use the Tisco parts and save my money. And BTW, make sure you have the early rather than the late C135 head (9 vs 14 bolts).
Stan(VA).

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BDM

01-06-2007 22:56:44




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 Re: Stan(VA) pistons in reply to Stan(VA)., 01-06-2007 21:39:30  
Let me see if I have it right, you can use a C135 head on a C123 block?



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Stan(VA).

01-07-2007 09:52:57




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 Re: Stan(VA) pistons in reply to BDM, 01-06-2007 22:56:44  
Like I said, just get the early one (same head as on the x30/x40 tractors). Intro of the 404/504 tractors is when they went to 14 bolts.
Stan(VA).



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Berry450d

01-06-2007 20:29:48




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 Re: Stan(VA) pistons in reply to Dale in ar., 01-06-2007 18:43:52  
If it is a 123 block you can put a rebore kit in it taking it to 135.



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