Ih c301 pistons in c263 engine October 30, 2012 03:35AM
Does anyone out there know if it is possible to turn my farmall 560 gas engine (c263) into a c301 by removing the sleeves in the c263 and putting 301 pistons in it
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Re: Ih c301 pistons in c263 engine October 30, 2012 03:43AM
The problem is that the sleeves have a counter bore at the top, so you would have to use a sleeve to fill that, then get it all smooth to put the 301 piston in. I would suggest rebuilding it as a 291, as they use sleeves. You will still need to bore the block to get the bigger sleeves in. I would love to get the measurements of the counter bore to see if an oversized piston could be used at that bore. But with custom builds like that, it gets expensive if you can't do it yourself.
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Re: Ih c301 pistons in c263 engine October 30, 2012 08:30AM
Ok thanks for the info
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Re: Ih c301 pistons in c263 engine October 30, 2012 12:23PM
get one out of a combine they don't have sleeves in them
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Re: Ih c301 pistons in c263 engine October 30, 2012 01:02PM
I have a M&W overbore kit that will take a 263 to a 291. I believe it is a set for a lp engine that would up the compression. You would have to bore the block,but it would be a sleeved engine. I would sell the kit, if interested shoot me a email. Also have a lp intake manifold also for sale
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Re: Ih c301 pistons in c263 engine November 01, 2012 09:21AM
On my block where it is stamped "C 263" the number below it is 24029 and casted in the block just to the right below that is another number 367511R3
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Re: Ih c301 pistons in c263 engine April 10, 2017 02:34AM
DO YOU STILL HAVE KIT? MY NUMBER IS 319-279-3539 DAN SCHULDT
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Re: Ih c301 pistons in c263 engine January 12, 2022 03:30PM
do you still have kit? my number is 641-691-3519. Mike
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Re: Ih c301 pistons in c263 engine November 01, 2012 01:01AM
Depends on the block. The later blocks were all the same. I would have to look the casting number up.
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Re: Ih c301 pistons in c263 engine November 01, 2012 09:37AM
Also think i located the casting date of 1 19 G indicating built in 1961?
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Re: Ih c301 pistons in c263 engine November 04, 2012 01:00PM
If I were you I'd just bore it out and put in 301 pistons. Get the biggest overbore (probably 0.030") and put those in. Kurtvtx is right about the counter bore, but all that does is lose you a titch of compression. I built a motor just like what your are doing (I started with a 221 block) and it ran great. With 806 manifolds and carb along with a custom cam it made 90 horse.
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Re: Ih c301 pistons in c263 engine November 04, 2012 10:33PM
Cheaper route would be to put in chevy 366 big block pistons. Makes it 320was cubes off the bat. I did this a couple years agoand could keep up with the big cube m's. That is though cause we run 2800 or 3000 rpms.
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Re: Ih c301 pistons in c263 engine November 04, 2012 11:33PM
How close do the 366 pistons run to the counter-bore size? Can the counter-core be left as is? And how much work needs to be done to the piston to fit it in? I was looking at this with my machinist, but he didn't really get what I was saying, and was not interested in custom parts! LOL
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Re: Ih c301 pistons in c263 engine November 05, 2012 12:23AM
You would still have to bore the block out. I if i remember right the counter bore would be gone.
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Re: Ih c301 pistons in c263 engine November 07, 2012 05:22AM
What size are 366 pistons? When we ran our 460 we looked into boring it out, but found that if we still wanted to run water in it (comfortably) we could only go out to 3.95".
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Re: Ih c301 pistons in c263 engine November 07, 2012 05:58AM
They list as 3.935 in stock form.
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Re: Ih c301 pistons in c263 engine April 10, 2017 10:54AM
Keep in mind you have to change the head. Also, I have done it with c301 pistons & with the Chevy pistons. I only gained 8hp with the Chevy piston over the 301 piston with everything else the same, at stock rpm. If I wasn't looking for all I could get I would go with the 301 piston. A lot less machine work. Like was said the counter bore that is left won't make much difference. People have been doing this since 1958.
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Re: Ih c301 pistons in c263 engine April 10, 2017 11:09AM
Sorry I just noticed this topic is 3 years old. I'm sure you are running by now.(lol)
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