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Old 10-10-2019, 05:32 PM   #4
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Join Date: Jan 2001
Location: Orem, Utah
Posts: 4,856
Re: another knock noise ?

You don't say what year 350 you have, but if it's a Vortec, it could be piston slap. Some of the earlier ones were especially noticeable.
If I didn't build it or fix it, it's probably not mine.
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