301 and 426 piston sizes
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Topic: 301 and 426 piston sizes
Posted By: DougG
Subject: 301 and 426 piston sizes
Date 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
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Replies:
Posted By: injpumpEd
Date Posted: 06 Aug 2017 at 4:20pm
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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Posted By: DougG
Date 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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Posted By: injpumpEd
Date Posted: 06 Aug 2017 at 5:43pm
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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Posted By: DougG
Date Posted: 07 Aug 2017 at 3:46am
Posted By: injpumpEd
Date Posted: 07 Aug 2017 at 12:11pm
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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Posted By: DougG
Date 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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Posted By: bsallis180
Date 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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