Spark Plug Question

I have a 1991 c-1500 with a 5.7L and have 30K miles on bosch platinums. Should I go back with bosch or switch back to AC Delco? It has 200,000 miles on it so I do not want to put in expensive plugs. Any recomendations?

I have a 1991 c-1500 with a 5.7L and have 30K miles on bosch platinums. Should I go back with bosch or switch back to AC Delco? It has 200,000 miles on it so I do not want to put in expensive plugs. Any recomendations?


The regular AC-Delco plugs CR43TS
I used to get them for 79 cents each now.
You should be able to buy them for around 2 bucks each.
And have A look at wires and cap and rotor and fuel filter to.

The regular AC-Delco plugs CR43TS
I used to get them for 79 cents each now.
You should be able to buy them for around 2 bucks each.
And have A look at wires and cap and rotor and fuel filter to.

I think that I will go with the regular AC Delco plugs. The wires are Bosch from AutoZone and I may look at night to see if they are arcing. The cap, rotor, and fuel filter are new. How long should the injectors last? These are originals and still work and sound good. The truck still gets around 17 to 18 mpg with about 60% highway and 40% city.

I think that I will go with the regular AC Delco plugs. The wires are Bosch from AutoZone and I may look at night to see if they are arcing. The cap, rotor, and fuel filter are new. How long should the injectors last? These are originals and still work and sound good. The truck still gets around 17 to 18 mpg with about 60% highway and 40% city.


I assume you have the 2 injectors in the TBI or TBI injection.
As long as it is running good the injectors may outlast the truck.
Good luck
MT