Originally Posted by cobalt327
You should be able to use more than 8 degrees BTDC initial timing. It sounds like the mechanical advance may have too light springs or the vacuum advance is giving too much advance and or is deploying at too low of a vacuum signal.
how much total advance can this engine run? or should run for best performance? and at how many rpm?
the distrubuitor I'm using is a Motorcraft points type (late sixties maybe) with dual pot vaccum advance, I have only the end fitting of the vaccum pot connected to ported vaccum, the other, the one closer to the distruibuitor body is left open to the atmosphere. There's nothing in the vaccum line, like restrictors delayers or something, just a straight hose from the carb to the pot.
it's not a race engine, it's a daily driver but having it performing well is really cool.