To find the correct settings, you need to consult:
* The original owner's manual: If available, this is the best source. It will list the specifications for your specific engine.
* The Pontiac GTO Shop Manual: This manual will have detailed specifications and procedures for adjusting the ignition system. A shop manual specific to the 1965 model year is crucial.
* The distributor itself: Sometimes, the distributor cap or the distributor body itself will have markings indicating the recommended point gap and dwell. However, this is not always reliable.
* A qualified mechanic: A mechanic experienced with classic Pontiacs, especially those with the tri-power setup, will know how to properly diagnose and set the ignition timing, point gap, and dwell for your engine.
General Ranges (Use with Caution): While you can find general ranges online, relying solely on them is risky, as they are not precise for your specific engine. Trying to set the ignition based on internet searches alone could harm your engine. General ranges are:
* Point gap: Typically around 0.018" to 0.022" inches.
* Dwell: Usually in the range of 28-32 degrees.
* Timing: This is the most critical and varies significantly based on the camshaft, carburetor setup, and other engine modifications. You'll need the correct specifications from a shop manual or a reliable source.
In short: Don't guess. Finding the correct information from your owner's manual, a shop manual, or a knowledgeable mechanic is essential to avoid damaging your engine.
