Check rockers & cam lobes for wear . Chevy was bad in 80's
With cam lobes going flat or wearing down lobe to loose rocker function.
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2000 Chev Blazer / S10 size , fuel gauge went bad fuel pump wasn't far behind comes as a set .
210,000 miles now + rebuilt trans at 164,000
Good vehicle LT model loaded nicely.
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U need to look at lobes on cam & top of valves to look for wear . on rocker
If no wear could be lube problem plugged oil port in block . not lubing
valve rocker.
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Add 1 quart of automatic trans fluid to oil run for 20 miles to clean push
rods if noise persists pull valve covers bad PCV Valve will clog inside engine
If noise goes away change oil immediately & check PCV Valve .
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