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Originally Posted by Ultrashock
I use NGK spark plugs for my blazer and they work just fine................
Not to be really off topic but are there any advantage/disadvantages to iridium spark plugs.
Dont they have any better use for meteor rocks then to make spark plugs out of them?
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A few GM trucks have switched to NGK factory install and replacements and some the iridium spark plugs.
It is safer and better to us the type of plugs that the good book calls for.
If you stray away from the factory OEM specs for the plugs you may run into engine performance problems and engine and cat damage if the right plugs are not used.
So far no other spark plug manf. has really matched the corrrect heat range/type of plug that a GM engine needs.
I always suspect that AC delco has the patent on it and will not let anyone else match it. Just my idea.
As far as Iriduim plugs I do not know the answer.
You might go to the GM and ACdelco web sites and get some info or get the lastest AC-delco spark plug application book.
I always though the platumin plugs were real good.
But who knows what they will start making them out of next.
MT