wich spark plugs?
Safety Car
Joined: Aug 2000
Posts: 4,933
Likes: 30
From: San Rafael CA
Chevrolet (remember those guys ????? they built your car ....) recommends the AC Delco 41-985 iridium spark plug. Your car came with platinum plugs with a recommended gap of 0.060 while the newer plugs come gapped at 0.040 and the iridium plugs out of the box are correctly gapped at this distance. You can buy them from any auto parts supplier ...... Napa ... Kragen .... Pep Boys ..... whomever.
Le Mans Master
Joined: Sep 2007
Posts: 7,604
Likes: 8
From: Belleville Il
Delco iridiums at .040 in mine after 54K and it really woke up!!! I am VERY pleased. Shortly after (on a cool night) I capped the night off with a 13.08/110.23 on Goodyear Run Flats. With only a black wing ,stock H pipe and Corsa Touring!! I'm quite pleased with the Iridiums !!
c5-pewter
Joined: Mar 2006
Posts: 488
Likes: 0
From: Coconut Creek Florida 33066
St. Jude Donor '08
Chevrolet (remember those guys ????? they built your car ....) recommends the AC Delco 41-985 iridium spark plug. Your car came with platinum plugs with a recommended gap of 0.060 while the newer plugs come gapped at 0.040 and the iridium plugs out of the box are correctly gapped at this distance. You can buy them from any auto parts supplier ...... Napa ... Kragen .... Pep Boys ..... whomever.
took out my NGK TR55 after only a few thousand miles and replaced them with ACs 41-985. However, mine (ACs) came out of the box all over the place, @ between .35 & 38. All needed a minor adjustment to .40. It may not be the case with all cars, but mine is a lot more responsive with these ACs under the hood. For my money GM knows best after all! GRT 
Last edited by c5-pewter; Jul 9, 2008 at 01:18 AM. Reason: spelling
