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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.
Your best bet is to visit a good auto shop (seller of antifreeze), and say "I want to buy enough antifreeze for a 1990 Chevy 5.7 truck".
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....
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