spark plug gaping
Racer
Joined: Feb 2004
Posts: 348
Likes: 6
From: Las vegas Nevada
Spark Plug Gap
Read the service manual or the specification sticker under the hood and check the gap before you install them. The Spark plug gap on the new plugs were all off the last time I replaced mine on my 98.
Race Director
Joined: Jan 2008
Posts: 16,027
Likes: 170
From: oregon
that's why the gap seemed off if your new plugs were gapped tighter
Pro
Joined: Aug 2009
Posts: 662
Likes: 0
From: Loxahatchee FL
As stated before, the plugs your putting in (stock replacements)is .045. Unless it was hit or dropped it should already be gapped to that. However YOU can gap them if you need to and very careful to pay attention to the small welded piece on top of the underside probe( sorry can remember the real name)
The old numbers in the books for our cars, 97-01 we're not the iridium plugs that GM says is now the stock replacement. That said you can not go based on the oem plug gap of yesteryear and the new gap for that plug is .045
The old numbers in the books for our cars, 97-01 we're not the iridium plugs that GM says is now the stock replacement. That said you can not go based on the oem plug gap of yesteryear and the new gap for that plug is .045
Racer
Joined: Feb 2004
Posts: 348
Likes: 6
From: Las vegas Nevada
gap.
No.......My gap is .045 (revised spec.) but the plugs only had a few that werer gapped to that specification. None of the plugs were gapped the same. Glad I rechecked before I installed them.
Race Director
Joined: Jan 2008
Posts: 16,027
Likes: 170
From: oregon
how far were they off? i checked mine just for the hell of it too and all were between about .042 and .048
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
Melting Slicks
Joined: Apr 2009
Posts: 2,479
Likes: 36
Be extremely careful when gapping iridium or platinum plugs. You risk damaging the electrodes and thus the reason that it is never recommended gapping these types of plugs. They should be pre-gapped out of the box.