i would "assume" a ting or tick from the head. a knock, i would "assume" spun or destroyed bearing, ill guess rod bearing, on my 5m when i roasted a main bearing it made no knocking, in-fact i drove it around for a while and had no idea...
but its just an assumption...
and codes should be check "EAR"-regardless
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1984 supra - 1uzfe - w58 - 4.10 - 1 piece aluminum shaft.
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