Spark Plugs
Thread Starter
Burning Brakes
Joined: May 2004
Posts: 929
Likes: 45
From: Wayne NJ
Spark Plugs
I want to replace the spark plugs on my 2003 LS1.The car has been Dyno tuned and has LT headers and a catback 6 speed. I was going to get the AC Delco irridium plugs but don’t know what heat range needed for this car. I’m open to suggestions.
Instructor
Joined: Oct 2018
Posts: 113
Likes: 21
From: Phoenix, AZ
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
DO NOT over think plugs and wires! There is NOTHING to be gained performance wise with anything other than STOCK Plugs! Look for quality parts! Some great recommendations for the STOCK iridium's and the GM Performance RED Wires!! The red wires are very well made and will last a long time.
Those will make your engine very happy again!
If you had a crazy cam, big heads, headers, forced induction race engine,
Then you would then need to worry about heat ranges and different plugs for that type of application..,
Those will make your engine very happy again!
If you had a crazy cam, big heads, headers, forced induction race engine,
Then you would then need to worry about heat ranges and different plugs for that type of application..,
Melting Slicks
Joined: Nov 2011
Posts: 3,174
Likes: 259
From: Virginia
This is exactly what I have and had no issues whatsoever. I can’t remember if I changed the gap or not though, I’m thinking I set them at .050. Wouldn’t hurt to put some plug wire socks on there if you have headers also.
