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The point gap for a 65 mustang that had a 260/289 V8 with a single point, vacuum advance distributor was .014-.016. A car with a 170/200 6cyl motor with the single point vacuum advance distributor was .024-.026, and for a car that had the high performance 289 with the dual point, centrifugal advance distributor it was .019-.021
Assuming you are running a point type distributor a Pontiac typically likes 12-14 degrees initial advance. This is also a good starting point for HEI.
this is not a diy job this would have to be done by your automotive shop and done right
It's been a while since I've messed with point type distributors, but if I remember correctly it should be 28-32 degrees.
average life of a 3.1 v6 with proper oil changes and tuneups lasts about 160,000 miles according to common reviews on engine life
The crystal lattice will slightly effect the high vacuum and eventually decrease the melting point particularly decomposing solids.
Spark plug gap is .035, point gap is .017 to .019 or 30 degrees dwell. Timing with the vacuum advance disconnected and plugged is 4 degrees. If you have a timing light with a dial for total advance then it is 35 degrees at 2,000 RPM.
With a hand vacuum very slowly vacuum to waste.
The halfway point between Billings Mt and Pontiac Mi falls in or around St. Cloud, MN.
They came equipped with a standard single breaker point with a vacuum advance. Electronic ignition (HEI) didn't become standard for the full GM lineup until 1975.
Disconnect any vacuum hoses from the distributor and plug them. Then you loosen the distributor hold down screws and turn it clockwise to advance the timing or counter clockwise to retard it. Tighten the hold downs, reconnect the vacuum lines and away you go.
Pontiac failed his goals when many smaller forts were seized by the Indians