Originally Posted by jeremylparker
Further update: After posting I checked 'AI' Claude in this case for Rover V8 tappet noise, it suggested that after running with no oil or standing idle for a period of time air in the 'lifters' could take a few minutes to be fully removed. So, just ran the engine again until hot and the tappet noise slowly disappeared! Phew! The oil pressure at tick over is just under 2 bar and around 3 bar at 2000 rpm. Not taken it for a run yet, that's tomorrows adventure!

Glad finally sorted Jeremy thumbs. Reminds me of an episode in the 70's painstakingly stripping and checking every hydraulic tappet on a Chrysler 383. Despite re-assembling with oil the noise on starting was deafening. Discussed issue with a friend who simply (and a little unconvincingly) suggested leaving it to run a little over idle if oil pressure showing which it was. After what seemed like forever but probably only a minute or so I noticed noise slowly then quickly subsiding. The ticking noise from one of the tappets, being the reason for stripping all in the first place, had dissapeared as well happy3. Drove down the pub to celebrate. On return journey ticking noise re-appeared frown ho hum...