Spark Plugs of choice ?

[codewize]

I'm getting ready to do an MSD ignition upgrade on my Seville. You know they have that, buy all you distributor parts in one kit to upgrade your stock HEI system. I will also be running MSD 8.5 wires

Anyway the question is what plugs does everyone use. There are AC Delco Rapid Fires in there now which I loved but they have well over 100k on them and it's time for some TLC.

:feedback:

 

[Roy]

Good question, I would like to know as well my STS is up to 50K miles and the service warrenty is now over, finally I get to work on it my self.

 

[ONEBADMK8]

I use the Autolite 764 Coppers. AMAZING plug.

 

[JoshMcMadMac]

Use copper plugs. They do the job, do it well, and won't break the bank. Don't bother with the $5.99 a plug quad-tip platinums, or whatever they are. They aren't worth it.

 

[Sifrino3]

Im a Split Fire fan. But I went in to an auto parts store and said they do no sell them anymore! (Sad)

 

[driller]

Autolites or Motorcraft for me. They probably don't fit the GM?

Either way stick with simple coppers for best performance or platinums, iridiums or silver for longest life.

 

[CaptainZilog]

Plats do nothing, the FTC sued the crap out of Bosch for making false claims about platinum plugs.