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Originally Posted by Perses
I'm curious what the connection is between Sun Electric Corporation and Pontiac ?
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Sun electric made the sun machines which allowed shops to test and "tune" (recurve) distributors. If you owned a car in the 1950's through the 1980's and had a shop work on it, at some point the distributor passed through a sun machine. They are a rare thing to see in a shop these days and recurving a distributor is a dying art.
Sun would get the maufacturer's specs and print them on cards. A mechanic would take the distributor off the car put it in the sun machine, and the sun machine would spin the distributor so you could check it at various rpm levels. Depending on the machine it could also give you readouts of certain information, set the advance, and tune the weights. The cards allowed you to "blueprint" the distributor according to the manufacturer's specs. I used to have a binder with a ton of old sun cards in it but it was destoryed in a basement flood (raw sewage otherwise I would have kept it).
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Originally Posted by Junkyard Dog
23 degrees is nowhere near enough at 3000 rpm. Where are you getting your procedures?
Set the initial timing in Park, with the vacuum line disconnected, and with the vacuum leak plugged, of course. You are going to have to adjust your idle speed back down, and readjust it if moving the timing moves the idle speed, then recheck the tiiming.
It sounds like you "originally" (your last paragraph) did it correctly. Do it that way again . . .
Dieseling can be something as simple as not enough octane for the car. My GTO would diesel with 87 or 89, but not with 93 octane gas. If your engine is still original, you may be pushing it on pump gas anyway . . .
If memory serves, that engine was rated at 10.75 to 1 compression (someone will correct me if I got it wrong) and really works out to 10.25 to 1, which is still pretty high for iron heads.
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The motor was rebuilt 5000 miles ago. It has 9.5 to 1 compression and used to run really sweet off 93 octane. When the motor was new the car was really fast (high 12's on slicks). I'm going to redo the timing, and yes the idle moves when you move the timing.
I am slowly coming to the realization that there is a distributor rebuild and a carb rebuild in my future.