I've been messing with timing, and it started me wondering how many degrees you can see in the inspection window on the flywheel cover. I can measure the size of the window--can anyone with a spare flywheel tell me what the diameter is? From those two I figure I can calculate the circumference, and from that how much advance or retard is represented by the span of the window. I'll post back to the thread if someonce can shoot me the diameter. Or better yet, does anyone know already?