I have used Petronix in several vehicles until my 51 with a 228/ 12 volt. After installing the unit, the truck backfires on deceleration with a load,(downhill), and has a slight miss/pop when idling. The truck gets horrible mileage ( Which may be normal) A local shop said I had some weak valve springs and I therefore had the head rebuilt. Guess what? Only a slight improvement!
Now, I am preparing to remove the Petronix and replace the points and condenser. But first, I had to locate a new distributor because the shop that installed the Petronix threw away the distributor base plate that the points are attached to.
Now, I will wait and see if there is an improvement with replacing the points.
