The distributor has a mechanical advance on springs and weights that
maxes out at just under 1600 rpm from what I understand, then the
computer takes over so the base timing is way down. No computer and set
the timing at idle at 7-9 deg with vacuum off, whichever sounds
smoothest, otherwise go by the hood sticker or book at 1600. You can
play there by a degree or two to to get the smoothest idle.

You are supposed to oil the felt pad in the center of the distributor
under the rotor every time you change the cap and rotor. If you open it
up and grab the rotor, it will turn under a spring load or it needs
cleaning and oiling if it's grabby.

Mike

Joe and Joann wrote:
>
> Thanks Mike, but I am still confused about the 1600 rpm. With the
> vacuum advance disconnected and plugged, is there a mechanical advance
> that happens between 700 and 1600. In any event, assuming I disconnect
> and plug the vacuum advance, do I set 9 degrees BTDC at 700 or 1600 rpm?
>
> Mike Romain wrote:
> > The book way is for the computer run carb 258 engine. At 1600 rpm, your
> > mechanical timing is full advance and then the computer takes over. I
> > believe the distributor vacuum line should be off and plugged too.
>
> snip