Ac delco has the professional iridium spark plugs. Anyone have knowledge with these types of plugs?

 

from what i read, the original copper plugs still give the best spark. will you notice a gain/loss with a different type of plug? i doubt it. the iridium are said to last longer. if you don't want to change the plugs for a long time, then i would say platinum or iridium plugs would be the way to go. i have never had first hand experience with the delco iridium plugs though.

 

just go for the simple NGK plugs. they are like $2 each and last reasonable long and don't cost you any power.

you can change out your plugs 3 times for the cost of a single set of plats or irridium

just my $.02

 

the acdelco profesional iridium spark are NGK's. by the threads it says NGK JAPAN.

 

Installed the plugs. And so far pretty impressed.