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41Theads on a 4"stroke x 3.125
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07-02-2018, 06:45 AM
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jimTN
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Join Date: May 2010
Location: Powell, TN
Posts: 2,509
Re: 41Theads on a 4"stroke x 3.125
If they are the heads I think they are, they look like they are filled. We tried them on a race car back in the 60s . No great results and a lot of heating.
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