NGK spark plugs
Thread Starter
TECH Enthusiast
iTrader: (4)
Joined: Feb 2009
Posts: 623
Likes: 5
From: Eeerrrwhere south, tx
NGK spark plugs Ok I'm about tochange my spark plugs and was wondering what I should gap them at. I got a LS1 WS6 with a borla catback only, nothing else. Is the factory recommended gap at .050 ok or is there a better gap for completely stock engine?
Joined: Sep 2004
Posts: 3,148
Likes: 12
From: Downers Grove, IL
When I looked into this, it appeared that the original spec from GM was 0.060. Which was revised to 0.040. The interesting thing is that it was revised when they switched to the iridium tipped plugs, there was a discussion on a forum somewhere that the reason for the new gap spec was that it was required for the iridium tipped plugs and not for the older copper electrode plugs. I think that I ended up gapping my plugs at 0.040 and meant to keep increasing the gap to 0.060 every couple weeks to see if there was a difference.....not that I ever got around to that LOL
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
Also take into consideration NGK only recommends to change the gap of their copper plugs by +/- .008, nothing more. So going from an NGK TR55 which comes gapped at .060 and changing it to .040 is not recommended.
Thread Starter
TECH Enthusiast
iTrader: (4)
Joined: Feb 2009
Posts: 623
Likes: 5
From: Eeerrrwhere south, tx
thanks guys, i actually gapped the tr55's at .050 and is running quite well, but now 2 weeks later its got a slight missfire when at running temp at times. I dont know what could be causing this, i only feel it at iddle and when shifting gears, its weird
