I have a 77 Chevy with a 350 after about 30min. of warming up at idle it knocks. What

Nicholas S

New member
can cause this? Also how can I properly Diagnose this problem. It is particulary loud in the front of the engine. Like you put your ear next grill infront of the radiator is where it is loudest. I can not hear it at all inside the cab.
 
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