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Old 09-12-2017, 07:36 PM   #19
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Join Date: Jun 2017
Location: Cherryville, NC
Posts: 869
Re: Any idea on what this knocking is 72 C20 350

Gotta love it "hamjet"...

Either the cam lobe has lost its lift profile or the rocker arm ball has worn thru the rocker arm...

Remove the last two rocker arms on the passenger side and check out the area inside the rocker where the ball the two seat areas...if they look the same, you have either a really bad lifter that has collapsed internally or a bad cam lobe...equals engine out in my books...

Post pics of the inside seat area of both arms and their respective pivot balls...

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