Well, after 19 years and 48,000 miles it's time to do this again. Last time, I was new to Yotas, and my "new to me" '89 was making all kinds of "rattling" noise at cold startup. I found this site and read all about it. Gathered up parts and went to work. Gave a try to do the" bypass cylinder head and oil pan removals" instalation.. Lucky me...worked fine. No leaks/no oil starvation issues. There WAS an issue though... the two pan-to-timing housing screws at the front couldn't line up. Delete/Crossed fingers, but no leak there. I didn't follow up, but I guess there were several changes in the 20r etc series that affected the timing cover.? I don't remember where I bought the timing kit, cover, etc...somewhere cheap... I did get the valve cover gasket from Toyota. Next/this time will be Toyota or Aisin etc parts.