Valves tapping loud
What the problem
With this late of year model,it may be time to rebuild head,valve,s are wore,sometime,s they can be adjusted,but if you have never redone head,it,s time to do so.
The engine was rebuild
They may be adjusted,but if valve cap is tight,you are looking at another rebuild.
Something else to check out is the condition of the oil. Is it oil? Thin? When was it changed last?
Agree, with Bmark,start with the basic,then go to the worst.
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