No TVS on 70
My understanding is there was no "3 prong vacuum plug" on 1970 GTO's.... it was replaced by the electrically driven "TCS" system.
Instead, there was a three prong electrical plug, that performed both temperture guage and vacuum advance control duties (via the TCS solenoid mounted back by the rear heater hose fitting). This was mounted in the passenger side "coolant port" on the intake.
Again, looking for confirmation of above from those in the know.
thanks
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