We had this engine rebuilt locally. Installed it in a 1986 Toyota pickup. I personally put the bottle of cam break in lube in it. We ran it @2000 rpm for 30 minutes We let the customer drive it a week. After a week we changed the oil and filter. I also adjusted the valves at this time. The customer is very good about oil changes and he uses Chevron delo 15w-40 in it. Now 2 years and 30000 miles later he brings it in because it's not running right. Here is what we found.