[philminotti]

Thanks for the replies. Perhaps I marked my balancer wrong. I have to pull the passenger side head anyway for a coolant leak, so I'll be able to check.

Ronbo, is there some link between manifold vacuum and timing that I'm not understanding? Mass-Flo is not a speed density system (as you know), and doesn't directly sense vacuum. I agree, my vacuum is disturbingly low, but I can't figure how low vacuum might create my timing problem.

phil