I doubt you can tell much difference in any major brand. don t waste your money on Exotic Plugs that claim big HP and MPG gains.. you wont see it. I personally have used Autolite and AC for 40 years. Never had a problem with a single one ,usually lasting well over 100,000 miles. Some of our Members swear by NGK, also good plug... I don t however recommend Champion. I ve had many failures with theirs. By the way, Welcome to SV.
A forum community dedicated to Chevy Corvette owners and enthusiasts. Come join the discussion about performance, modifications, racing, restoration, classifieds, troubleshooting, maintenance, and more!