Loose valve rockers
I had a valve tap in 1990 S10 4.3L. I removed the valve covers, rockers, push rods (individually), cleaned them and reinstalled torqued to 20 ft-lbs. put the covers back on and now it wont start. Timing appears to be off. All 12 rocker nuts went way further in than they were. What did I do wrong?
The engine needs to be running when you want to try and adjust rockers. You need to back them all off. At this point you should find a used set of valve covers, cut an opening so the oil doesn't pump out all over the manifolds etc, loosen them all off back to factory setting then adjust with the engine running. Are you sure the valve tap you heard wasn't just some poor fuel grade or needed tuned with a timing adjustment rather than going straight to the valve train?
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