Spark Pugs
Administrator
Joined: Mar 2001
Posts: 368,319
Likes: 24,777
From: In a parallel universe. Currently own 2014 Stingray Coupe.
C7 of the Year - Modified Finalist 2021
MO Events Coordinator
St. Jude Co-Organizer
St. Jude Donor '03 thru '25
NCM Sinkhole Donor
CI 5, 8 & 11 Veteran
I went with the AC Delco Iridiums when I did mine. Got them from Gene at gmpartshouse.com. At the same time I went with the GMPP red plug wires.
Racer
Joined: May 2010
Posts: 255
Likes: 0
From: Beckley WV
I went with NGK TR55's gapped around .50, and taylor spiro pro 8mm wires. I had a slight miss prior to the swap and it went away as well as seemed to gain a little power. The link below is the guide I followed and I definitely recommend the double swivel socket. http://c5forum.com/diy/sparkplugs.php
Safety Car
Joined: Oct 2007
Posts: 3,903
Likes: 1
From: You know your drunk when you swerve to miss the tree then you realize its your air freshener! Covington Ga
NGK TR55's here. You will never gain power from plugs or wires. It will only make the motor run the way it should. Thats makes people think they picked up HP.
Racer
Joined: May 2010
Posts: 255
Likes: 0
From: Beckley WV
OK so the motor now runs the way it should have prior to the plug change, I guess I should have stated restored rather than gained. What ever you want to call it I like it!
Melting Slicks
Joined: Nov 2006
Posts: 2,431
Likes: 3
From: Iowa City Iowa
I also got my iridium's and GMPP red wires from Gene. I left the gap alone as many on the forum say these plugs come properly gaped and should not be re-gaped. My car runs perfectly with these plugs and wires installed.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Team Owner
Joined: Feb 2000
Posts: 51,504
Likes: 6
From: Sacramento CA
Team Owner
Joined: Feb 2000
Posts: 51,504
Likes: 6
From: Sacramento CA
Team Owner
Joined: Jul 2004
Posts: 30,045
Likes: 4
From: Danville Virginia
Great combo 
Melting Slicks
Joined: Nov 2008
Posts: 2,938
Likes: 65
From: Rochester Hills MI
Race Director
Joined: Aug 2003
Posts: 16,270
Likes: 30
From: "It's 106 miles to Chicago, we've got a full tank of gas, half a pack of cigarettes, it's dark, and
St. Jude Donor '03-'04-'05-'06-'07-'08-'09-'10-'11-'12-'13-'14-'15-'16-'17-‘18-'19
NCM Sinkhole Donor
In our shop we use the NGK almost exclusively - TR55 for the naturally aspirated mostly stock cars and TR6 (slightly cooler heat range) for the forced induction or heads and cam cars. We also use the GM red Hot Wires exclusively. This combination has produced great results.
As far as gap - we generally gap to .045.
As far as gap - we generally gap to .045.
