I've installed two DOA timing kits and have been satisfied with both. I didn't pull the head either time and didn't have any leaks, but, as Bill Morgan said, you might just as well pull the head and replace the head gasket while your into the engine. I just got done doing a head gasket replacement on my 85 4Runner with 143,000 miles. I did the timing chain at 133,000 miles. It would have been much simpler to do both at the same time.

Also, I think the money is well spent to get DOA's kit with all steel guides. On both 22R engines I did, it wasn't just the driver's side guide that was broken.

Allan