Quote:
Originally Posted by trevarthan
I've tested the vacuum advance on the distributor with a rented hand held vacuum pump. Seems to be working (saw the lever move), but I don't know if it's within spec or not because I don't know the specs or where to find them.
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Sounds like the diaphragm is good then. You can find the specs if you know what your distributor came out of. Likely a smogger with too much vac advance though. What are your plugs gapped at? If you don't already know, HEI gap is .045
Quote:
Originally Posted by trevarthan
Granted, I haven't set the idle yet, but a quick check with the timing light and the vacuum advance disabled indicates 14 degrees before TDC.
The plate under the hood says 4 degrees BTDC, but I see a lot of people on the forum here saying 12 to 14 is fine.
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Your timing is good to go. That 4 degrees is a factory safe number to keep warranty and recall issues to a minimum. Gotta protect that pocketbook. 12-14 degrees is a performance number which optimizes engine efficiency. Regardless, total timing is more important to set.
Still sounds like the carb needs a good cleaning and rebuild.