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Paul Workman · 08-06-2021

Pete Polatsidis put me onto AC Delco COPPER plugs (41-602) gapped at .042". They sparked his stock block LT5 to 11.xx sec quarter mile runs @ close to 129 mph in 3rd gear!

The copper plugs are cheap enough that you can replace them annually w/o breaking the bank (about $2.50 last time I bought mine) - less than a tank full of 93 octane.

Plug wear is insidious enough that you don't really notice the degrading performance in normal driving until it becomes bad enough to cause misfires under load - somewhere above 10,000 miles for a copper plug, 50k+ for rare earth plugs. I seldom go more than 3k miles B4 putting in new plugs. That way I never have to think about plugs - especially when optimizing the tune.

Justa thought.

08-06-2021	#4
Paul Workman Join Date: Nov 2007 Location: Squires (near Ava MO in the Mark Twain N'tl Forest) - Missouri Posts: 6,466	Re: Spark plug gap *Pete Polatsidis* put me onto *AC Delco COPPER plugs (41-602) gapped at .042".* They sparked his stock block LT5 to 11.xx sec quarter mile runs @ close to 129 mph in 3rd gear! The copper plugs are cheap enough that you can replace them annually w/o breaking the bank (about $2.50 last time I bought mine) - less than a tank full of 93 octane. Plug wear is insidious enough that you don't really notice the degrading performance in normal driving until it becomes bad enough to cause misfires under load - somewhere above 10,000 miles for a copper plug, 50k+ for rare earth plugs. I seldom go more than 3k miles B4 putting in new plugs. That way I never have to think about plugs - especially when optimizing the tune. Justa thought. Last edited by Paul Workman; 08-06-2021 at 06:57 AM.