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Old 08-28-2013, 05:30 PM   #1
vetteson
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Default plymouth 259 pistons in a 241 Dodge hemi

Will 259 Plymouth pistons clear the valves in an over-bored 241 Dodge hemi (using stock cam)? I see that the pistons in the 241 are notched.
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Old 08-28-2013, 05:51 PM   #2
snaptwo
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Default Re: plymouth 259 pistons in a 241 Dodge hemi

I would think that the Mopower engineers put those eyebrows in for a reason don'cha think.
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Old 08-28-2013, 05:57 PM   #3
TR Waters
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Default Re: plymouth 259 pistons in a 241 Dodge hemi

The notches in a hemi piston are directly across from one another. The notches on a poly piston are offset from one another. With a bone stock cam, you should be able to get away with it. Other than that, I would consider massaging the notches to replicate the hemi piston. Keep in mind that in stock form, these are very low compression engines.
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Old 08-28-2013, 07:18 PM   #4
wbrw32
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Default Re: plymouth 259 pistons in a 241 Dodge hemi

Pistons MUST match bore and stroke ..IF those are the same then the pistons will work..albiet the tops will look different..
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Old 08-28-2013, 08:17 PM   #5
73RR
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Default Re: plymouth 259 pistons in a 241 Dodge hemi

That is a pretty big cut...suggest that you sonic check the cyl walls as a first step.
As Tom suggests, if you use them, lengthen the eyebrow a bit. It sounds like a stock-sorta rebuild so balance should not be an issue.

In the FWIW department, for a couple hundred more dollars you could have some decent compression...


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