Picking the Right Spark Plug for Your 80's Car or Truck

[@scottgrygiel1377]

The C in front of the R means it's intended use is for commercial applications. The electrode is slightly thicker than a standard plug. Bith are copper

[@mr.hanger]

I've always thought that on an engine that hasn't been modified the plugs it came from the factory should be what goes back in it. Brand name and everything.

[@rporestorations]

I tend to agree with you. And that's what I do.

[@user-zi4wu1im8q]

So you think the copper platinum iridium are the materials used?

[@rporestorations]

For the tip, yes.