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Old 09-12-2017, 02:48 PM   #4
Chilly178
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Join Date: May 2016
Location: Green Bay, WI
Posts: 129
Re: Any idea on what this knocking is 72 C20 350

I did take the valve covers off before and all the rockers were on a few of them had a tad of play and I looked at all the push rods and most of them were good again some of them may have had the slightest amount of play. Is this enough for it to rattle this loud? Should I take the valve covers off again and tighten all the rocker arms? Is there a torque spec on those? I guess I didn't really know what to look for specifically.

EDIT: I just ran the truck again the knocking gets louder and faster the higher the truck revs and it sounds like it is coming from the passenger side possibly towards the rear of the engine if that helps.

Last edited by Chilly178; 09-12-2017 at 03:25 PM.
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