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DougG 
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Joined: 20 Sep 2009
Location: Mo
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 Topic: 301 and 426 piston sizes
Posted: 06 Aug 2017 at 3:26pm |
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Curious on the sizes of 301 and 426 diesel piston , how different are they by size?Can a 301 block be machined for 426? Just curious
Edited by DougG - 07 Aug 2017 at 5:07pm
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injpumpEd
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Joined: 13 Sep 2009
Location: Walnut IL
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Posted: 06 Aug 2017 at 4:20pm |
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301 is 3 7/8" bore, 426 is 4 1/4". Not sure what you're wanting to do, but not sure how you'd make a 301 piston ever come close to working in a 426.
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210 "too hot to farm" puller, part of the "insane pumpkin posse". Owner of Guenther Heritage Diesel, specializing in fuel injection systems on heritage era tractors. stock rebuilds to all out pullers!
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DougG
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Posted: 06 Aug 2017 at 4:55pm |
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301 block machined to accept 426 piston, just wild ideas
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injpumpEd
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Posted: 06 Aug 2017 at 5:43pm |
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a fairly popular thing to use is case 401 pistons modified for a 301, and custom sleeves. They are 4 1/8" bore. ops heads on here sets up kits. I have a bunch of those pistons that need finished machining.
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210 "too hot to farm" puller, part of the "insane pumpkin posse". Owner of Guenther Heritage Diesel, specializing in fuel injection systems on heritage era tractors. stock rebuilds to all out pullers!
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DougG
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Posted: 07 Aug 2017 at 3:46am |
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I gottcha, thanks!
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injpumpEd
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Posted: 07 Aug 2017 at 12:11pm |
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From what I've been told, you have to have the top of the case piston machined. I have not done this, yet. Some day I may get around to building my 301, but until then, that is all I know about the piston deal. I'm not making them, or anything like that, so no point in calling me and asking questions.
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210 "too hot to farm" puller, part of the "insane pumpkin posse". Owner of Guenther Heritage Diesel, specializing in fuel injection systems on heritage era tractors. stock rebuilds to all out pullers!
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DougG
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Posted: 07 Aug 2017 at 3:29pm |
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I'd say it would take alot of head work to get it to run good as the heads don't flow real great
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bsallis180
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Posted: 08 Aug 2017 at 8:43pm |
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We have a 4.5 bore with custom sleeves and bored block. That's about the 100%max you can go with a 301 on bore. Have to have a deck plate to keep top of block together. I have started another project with some help it's a 451 case piston that I will all so be running a deck plate it is in the works and on hold. Hopping that the smaller bore will make it live longer.
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Iron horse
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Joined: 15 Jan 2025
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Posted: 15 Jan 2025 at 3:13pm |
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What all needs done to the pistons or do you have a set done to sell
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