Well I think it is good news. Have inspected everything and just about everywhere it could have come from and nothing worn or broken, no pieces missing. Rotated cam and followers 360 deg plus and no damage. The closest match I can find to it is the cam. I would say the cam has been replaced at some stage and may be residue from that job. Talked to a few mechs who said while it should not happen, debris gets left in engines often and can sit nicely on a lip or ledge for years before coming out the sump. All back together and runing sweet as. Engine internals are in great condition, all still like new with only minimal wearon the cam and followers.
Took some pics but quality was crap so have not posted.
2 days wasted I could have been fishing.

Anyway thanks to my TA (Mel), probablly have just saved over a grand in labour for a thorough inspection, may haveto get her a bottle of wine tommorow.
Thanks to all for the advice, most valuable.
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