E30 Zone

After swapping in the Dbilas cams, my M52 now sounds almost tappety (M20 like) after 2000 rpm or so. I swear that it wasn't there before.

Any thoughts on whether this is something to be concerned about? Any need to whip the cam cover off again and check the timing is OK? Everything else seems to be running fine.

Cheers,
Gus

Any ideas? Driving to France tomorrow so really, really don't want anything to go wrong.

Rechecked timing, did chain tension, and it still sounds kind of tappety/chainy, and if I rev from standstill there almost seems to be a small rattle around 3K rpm or so. Video here: https://flic.kr/p/v2QLff

Any ideas on what it could be?

Thanks!
Gus

Where they new cams ?
Did you run them in ?