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You tell me how to tighten a valve, can’t find threads anywhere on those things?
A “loose” valve will tick, in my experience mostly at idle. A valve can’t just tap a piston, they can’t occupy the same space unless something is very wrong.
A tweaked/leaking valve will set a misfire code almost immediately. The sound of a leaking intake valve is not metallic.
I’ve replaced countless heads, pistons, bearings, etc for all kinds of noises. Each one is pretty clearly a different noise.
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