ACDelco R45S conventional spark plugs for an original ignition system.
A/C delco
A/C Delco and put the # in it that it calls for from the factory.
The Chevy 327 was manufactured from 1962 to 1970. It was only available for eight years. The Chevy engine was considered one of the best of its time and was good if racing a car.
The original A/C Delco plugs are hard to beat. Just get the right heat range for your application.
What grade of oil is best in your 5.3 liter Chevy engine?"
Need to know the year of engine. They are all different. The brand should be AC Delco according to my father, Champion are for Fords!
I believe ngk r the best....
It has been my experience that what the manufacturer used is the BEST choice. Your truck came with AC Delco and they will give you the best and longest performance.
.040 for best results
you could find the spark plugs on each side of the engine behind the wheels....that is the best way to get to them, using a long extension and rachet...the hardest plug to get to is the #1 plug....that plug has to be removed from on top....
There are three spark plugs on each side of the engine. They are best accessed by removing the front tires and going through the wheel well opening with a 3/8" drive spark plug socket and a long wobble extension.
AC plugs