Not much progress to report, but thanks for the inputs. I believe I am getting close on the IP timing, ran it about 10 minutes - mucho clatter and white smoke, so I know I have the valves too loose. Now I'm now distracted by a gusher from the turbo oil return pipe - lower section. I installed a new one in this idiotic quest to stop all leaks, and it thanked me by immediately producing a 10" puddle. Fastest leak I think I've ever seen. I'm pretty sure I had the new grommet and O rings in correctly, so I guess it is another bad OE pipe - I bent it getting it out so I can't tell for sure. BigMac