Spark Plugs
Melting Slicks
Joined: Sep 2004
Posts: 3,225
Likes: 667
From: Northeast
Many to choose from. I have been happy with the Accel High Performance Header plug on my 350. Stock heads. https://www.summitracing.com/parts/acc-0576s-4
Le Mans Master
Joined: Apr 2011
Posts: 6,284
Likes: 1,171
From: Hermosa
Le Mans Master
Joined: Aug 2017
Posts: 8,336
Likes: 2,810
From: Cool Northern Michigan
Just a note here on Heat Range code numbers, which I believe is the last digit of the part number:
Some sparkplug manufacturers heat ranges are from 1 - 9 with nine being the hottest plug.
Other manufacturers use 1 - 9 with nine being the coldest.
Isn't that insane?
Some sparkplug manufacturers heat ranges are from 1 - 9 with nine being the hottest plug.
Other manufacturers use 1 - 9 with nine being the coldest.
Isn't that insane?
Last edited by HeadsU.P.; Mar 10, 2018 at 08:22 PM.
Drifting
Joined: Aug 2009
Posts: 1,346
Likes: 160
From: new iberia la
You will find that for most stock motors, any good brand is about the same as any other .. NGK, Autolite, AC Delco Bosch.. all fine in the proper heat range .. Don t waste big bucks on exotic plugs.. Not worth it! .. I do make exception for Champion plugs.. I have seen so many Champions fail in my Marine engines, I no longer buy anything Champion
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
Melting Slicks
Joined: Dec 2009
Posts: 3,232
Likes: 656
From: Thunder Bay
You will find that for most stock motors, any good brand is about the same as any other .. NGK, Autolite, AC Delco Bosch.. all fine in the proper heat range .. Don t waste big bucks on exotic plugs.. Not worth it! .. I do make exception for Champion plugs.. I have seen so many Champions fail in my Marine engines, I no longer buy anything Champion
Terrible luck with Champion plugs. Others all seem to be good. Personally I like Accel, partly because their shorties clear my headers better.
Race Director
Joined: May 2006
Posts: 18,728
Likes: 2,579