I did a search for OEM Spark Plugs. I found 41-993 AC DELCO as the right plug. But when I look up that number on Rockauto I can't find that number. I find Rapid Fire & a few others. There also seems that there could be an updated number?
Can someone tell me what spark plugs I should use in my 98 Blazer LT 4.3L I want to go with AC DELCO PLATINUM PLUGS. Because I believe some version of their platinum plugs are OEM.
Thanks in advance.

 

41-993 is the iridium version of the plug and is usually suggested as the OEM replacement. Scroll down a little bit more and you'll see it if you searched by vehicle.

 

Thanks I found it finally. What are the difference between the rapid fire & the OEM plugs besides a few dollars each?

 

Not sure, I think the RapidFires are just a hotter plug. I'm sure someone else can give better info.

 

Thanks for the info. I see autozone has a rebate on the AC DELCO plugs. $2 on ea 41-993.
I'll hope someone else chimes in with possible more info on the Rapid fire plug.

 

https://blazerforum.com/forum/showth...t=38372&page=2

 

The older AC Delco 41-993 Professional Platinum plugs are double platinum plugs (platinum tips on the center electrode & ground strap to better resist spark erosion) that will last A LOT longer than the rapid fire plugs will. The rapid fire plugs are regular copper plugs that won't last nearly as long as the double platinum plugs in these high energy ignition system vehicles.

AC Delco has upgraded the 41-993 plugs to their Professional Iridium (platinum ground strap with an iridium center electrode) which is available through retailers with higher inventory turn-over rates. Iridium has all of the benefits of platinum in terms of resistance to spark erosion with an added benefit of being able to be manufactured to a finer tip diameter for better spark control.

IMO, you can't go wrong with either, but if you are going to pay $5+ per plug, make sure you get the iridium plugs.

 

Thanks Kyle for the great explanation. I'm not a fan of changing these plugs & I most likely will have to change plug wires because of the heat this Blazer has lived in. Las Vegas & Arizona for the last 5 years. Since most people don't use an electrical grease on the wire boots they seem to break or tear when removed. On our 97 Blazer I used the OEM Plugs & they lasted me almost 100,000 miles & they are still going. So I will go with the Irdium plug. Since Autozone & AC DELCO have a rebate until June 30,2012 of $2 on those plugs that makes them $4.40 ea. + tax. There is an Autozone within walking distance.
Thanks again for the advise I will take it.

 

I put the AC Delco Iridiums in my 03 at 70K. I personally think 100K is long run for a spark plug. When I pulled out the OEM plugs one of them had a cracked resister.

 

I ran a set almost 100K then sold our 97 Blazer & they are still going. I just installed a set of 41-993 AC DELCO plugs in our 98 Blazer 4x4. What was in there was a new set of cheap standard Autolites #605. The AC DELCO plugs have helped & seem to run better.
Did you have a miss or any idea that one plug was cracked? I'm assuming your referring to the porcelain part of the plug?