Volvo :: 1996 850 Turbo Wagon Engine Knock?

I just got my 1996 volvo 850 turbo wagon running, after I replaced a valve, lapped all the valves and replaced all valve stem seals/full stage zero(timing belt, plugs, wires, cap, rotor, thermostat). Boy was she a strong runner, for the whole day it was running. I do admit to abusing it quite a bit. But what else would you expect from an 18 year old kid who just rebuilt his first volvo engine ? Now, i will note that the car had horrid previous owners, that took no care of the car(ran it low on oil and who knows what else). I know I ran it out of oil once, on the way home from buying it.....the guy did not put the oil filter on tight enough, and it blew the oil filter seal out. Luckily volvo's have low oil sensors. after i rebuilt the top end my engine was throwing out blue smoke for a while, but i thought it was just a bad turbo bearing.

Anyways, to cut to the chase; My engine sounds like this one. [URL]......

I did a compression check, all cylinders at 180 psi. all my lifters look good. I had a few plugged oil passages in the cam cover, but none that go to the lifters. i pushed on all valve springs, they look good. i used a screwdriver and hammer to check if the valve guides pulled out, and the valves are solid in place. I was still making boost even though the engine was knocking like this, so i know its not a rod bearing, because the knock sensors would have picked up on it and dropped the boost.