Spark Plug Indexing...
Race Director
Joined: Sep 2001
Posts: 14,664
Likes: 749
From: NEwhere Ohio
Again, im doing mine for detonation resistance, not for a HP gain.
finally, if you have long tube headers, accessing/replacing a plug is way easier than with a stock exhaust manifold. I have TPIS LT headers and its considerably easier
Le Mans Master
Joined: Jul 2007
Posts: 5,043
Likes: 8
From: Tampa Florida
It's hard to believe this thread is still going. I wouldn't be disagreeing with all of you if I didn't have something to back up my argument.
http://www.hotrod.com/pitstop/hrdp_1...ech/index.html
http://www.hotrod.com/pitstop/hrdp_1...ech/index.html
Are you serious - The video was just to help the OP understand how easy it is. Indexing washers are super inexpensive and may actually let you free up some unrealized power. New plugs that haven't been installed will let you can get ~ 1/2 to 3/4 of a turn on them before the washer is totally smashed flat from snug so chances are you only need apply about 4 indexing washers. Trial and error should take less than 5 extra minutes per plug. There are a 1,000 ways to skin a cat. I'm pretty sure the guy knows you don't need the socket with the magic widow that's shown in the video.
Thread Starter
Racer
Joined: Mar 2010
Posts: 291
Likes: 1
From: Temecula Cali
Rob
Race Director
Joined: Aug 2000
Posts: 11,470
Likes: 763
- i just spent the better part of a day removing the plugs and installing new ones in my 90. i was able to get a torque wrench on all 8 of them, and at 20 ft lbs, that's all the frickin' indexing i need. there's no way in hell i'd index the plugs in that L98 - at least while the engine's in the car. IMO, indexing hits the point of diminishing return - a LOT of work for very little return. wrenching on my car is fun and sometimes therapeutic, but my poor hands - they're cut, scraped, bruised, and hurt a lot. i'm sure glad i don't have to do that for a living - 
indexing the plugs on that car - you've got to be kidding me... 
