After searching & searching about plugs...

[LS1JAY]

I know that the plugs will need to be gapped @ .043 and that most people like the NGK's, but my question is... can you use the 100,000 mile plugs like they run in the V8's or will there be a problem? I'm not worried about the cost and plan on doing it myself. I always worked on my GM LS1 motors, so I have some know how, just not really familiar with this motor. Also... which NGK plugs do I need? I actually ran the NGK TR55's on my LS1 motors and really liked them a lot!

 

[alotawatts]

Here is a link to an NGK crossreference guide:
http://www.spark-plugs.co.uk/

Allow me to hi-jack your thread and talk about plug gap specs.
My manual (2001) indicates .043 gap for NGK and Denso. I bought new plugs and both brands came out of the box pre-gapped at about .040 or less. When I pulled my original plugs out at aprox. 35k miles they were fairly worn out and the gap on all of them was less then .043.
I set my new plugs at .042 but have to wonder now if even that is too much ? 0.043 seems to be what everyone talks about but now I question it.
Ideas anyone ?
thx

 

[jeober]

I happened to pick up plugs at the dealer today so I have the PNs with me:

Denso K20HR-U11
NGK LFR6C11

These are the 30,000 miles ones for the V-6. The Denso's cost me $2.90 ea. at the dealer.

Spark plugs and the iridium versions have been discussed at length . Caveat: If you receive warranty work on the engine be prepared to show proper service records. For some reason, Toyota elected to use a standard plug here - maybe cost-driven since (dealer) service of these plugs in a V-6 is easy.

 

[greasefingers]

I just measured a sheet of photocopy paper with my micrometer. It measured 0.004

 

[LS1JAY]

my dad would stick the feeler gauge in the plug and then bang the plug on the concrete floor, to set the gap. But I have to respect him however. He grew up farm and farmers can fix anything mechanical.

I've done that myslef!

 

[alotawatts]

So

I re-checked the gap on the Denso K16TR11 and NGK BKR5EKB-11 original / factory plugs that I pulled with aprox. 35k miles. Even worn they are gapped at about - .037 or less. I wish I had checked the gap on the new ones out of the box before I set the gap.
.043 to .037 still seems like alot. Ignition plugs, points and the like have close tolerances for a reason.
Doing more checking ........................

 

[NCSCOTT]

Re: So

.043 to .037 still seems like alot. Ignition plugs, points and the like have close tolerances for a reason.
Doing more checking ........................

By using a smaller gap your are effectively advancing the timing. Less gap + same voltage as before= the spark will jump quicker. Understand I am talking about milaSeconds if not nanoSeconds. The computer should be able to adjust for any reasonable gap.

Toyota engineers specified .043 for a reason. It may put the gap in the midrange that the computer can adjust for. Just a theory???? I am not a ignition systems Engineer so just a thought.