While I was replacing my Pertronix distributor with an original distributor with with a Pertronix upgrade, I decided to compare the measurements on the three different distributors that I have. The one on the left ii a Mallory dual point, the center is the Pertronix and the end one is a stock distributor.
I took the overall height measurement from the bottom of the distributor gear to the top of the spark plug tower(not the coil tower) on the cap. The only measurement that I did not write correctly is on the Pertronix. The measurement from the bottom of the flange(that sits on the intake manifold) to the center of the oil groove is not 14 5/8", it is 4 5/8". I did add an extra washer to the stock distributor to reduce the end play on the shaft.
One other point to mention is that the Pertronix distributor uses a stock distributor cap and rotor, but the square locating notch is 180* opposite the original distributor's notch location.
I took the overall height measurement from the bottom of the distributor gear to the top of the spark plug tower(not the coil tower) on the cap. The only measurement that I did not write correctly is on the Pertronix. The measurement from the bottom of the flange(that sits on the intake manifold) to the center of the oil groove is not 14 5/8", it is 4 5/8". I did add an extra washer to the stock distributor to reduce the end play on the shaft.
One other point to mention is that the Pertronix distributor uses a stock distributor cap and rotor, but the square locating notch is 180* opposite the original distributor's notch location.