Spark plugs
 

Which spark plugs are the preferred ones to use? Which brands to avoid and which ones are junk. The application is 302 sbc. Thanks Frank

9 times out of 10 I use Autolites. I think I have one car here left that might have AC Delco plugs but I started getting away from them years ago when they started conglomerating heat ranges, many went away, others hard to find, etc...

I've had the same set of Autolites in our 302 for 6 years. Great plug.

One other car here I use NGK in, which I also like.

----My engine builder uses nothing but Autolite!.....Bill S

Ngk
 

NGK works good for me.

These days I use NGK on everything from my BBs to my 2-stroke Kawasakis.

Autolite in my 427.

I use NGK #5 for a good heat range on my 302,

Dave
67 Nova Boy

I use Holley's.

AC Delco Rapid Fire...