Thread: Not your normal engine knock

Tweet

I'm not one to post a question in forums. I can find any answer with the help of Google. I have researched for hours and can't find one thread that matches my symptoms. First I have a SB 350 +.03, mild street comp cam, 650 DB, manifold, L31 vortec heads and headers. Not a daily driver. 100 to 200 miles a month. Noticed small blowby in July (has not gotten any worse), yesterday I drove to the store noticed run on or dieseling, Run on happened 3 times. I pulled a spark plug and noticed it was oil fouled. then today was driving 50mph (engine normal temp, oil pressure good) got a steady tink/knock that increased in sequence with RPMS. opened hood sound was coming passenger side valve cover. Immediiatly putted home at 25 mph then the knocking just stopped. The knock maybe lasted a total of 3/4 mile. In trying to diagnose I can't get the noise to repeat (luckfully). Normally run 92 octane +octane booster. This tank was run with no booster. Any ideas?