Timing chain

I just replaced mine and when I rolled it over with a breaker bar had almost the same sound you have described. Took off the timing cover and found the Woodruff key was so worn out it was barley grabbing at the slot in the gear and thus the valves were not all opening and closing properly. Also the fuel pump arm was pressing against the round smooth "cog" that bolts to the front of the upper gear causing the gear to not spin true. I could hear a kind of "clicking" noise and a sound that sounded like a bike chain being slowly turned when I turned it over. I Ordered a new set of woodruff keys from Summit and also decided to order a new thrust plate.