Friend has a newly rebuilt 228 engine. Vac advance was not working, wo he pulled the dist and fitted a new vac advance. Its not 180 out of time. New points set at .016. The distributor that came with the engine is a 1112360. The book sais it should have a 1112390 however I do not know the difference. Here is the problem. With the vac hooked up the only way to stop engine knock is to retard the octane selector 3 clicks or 6 degrees??? Whats going on here? The initial advance is set nuts on the mark on the flywheel. However when adding in 2-3 clicks advance on the octane selector it starts to knock. Again the only way to get it to stop is to dial in 3 click or 6 degrees retarded? This has got me stumped? Could this be too strong a vac advance, we may have to limit the vac advance arm movement? Maybe it the wrong vac advance? Any and all ideas welcome.
