LT5 Spark Plugs - ZR-1 Net Registry Forums

Nick · 08-18-2005

What spark plugs are you guys running? My lightly modified LT5 runs very well on the GM specified AC Delco 41-913's. I recently tried a set of Rapidfire #5's and I'm having some problems with detonation. I think the plug's heat range is too hot, so I'm going to try a set of Autolite double platinums, for no other reason than availability and price ($4 apiece versus $10 apiece for the AC Delco 41-913's).

My research indicates that the Rapidfire #5 will work, if you start the engine and don't warm it up before driving, and if you do not drive it aggressively.

Anybody here fit that criteria?

I also understand that the Rapidfire #9's might work better. Comments?

08-18-2005	#1
Nick Join Date: Jul 2005 Location: Auburn, Washington Posts: 585	LT5 Spark Plugs What spark plugs are you guys running? My lightly modified LT5 runs very well on the GM specified AC Delco 41-913's. I recently tried a set of Rapidfire #5's and I'm having some problems with detonation. I think the plug's heat range is too hot, so I'm going to try a set of Autolite double platinums, for no other reason than availability and price ($4 apiece versus $10 apiece for the AC Delco 41-913's). My research indicates that the Rapidfire #5 will work, if you start the engine and don't warm it up before driving, and if you do not drive it aggressively. Anybody here fit that criteria? I also understand that the Rapidfire #9's might work better. Comments?