Ok, I figured I'd do some looking around while I was at work today after a lot of confusion on the boards over the NGK spark plugs. Here's some useful information for ya.

I will list plugs first by plug name (the ones most people are familiar with), followed by the stock number (what shops/stores use). I will also list the factory gap for plugs I checked personally.

Heat Range 5

Plug Name - Stock Number - Factory Gap
TR5 - 2238 *Copper Plug* (0.035")
TR5IX - 7397 *Iridium Plug*
TR55 - 3951 *Copper Plug* (0.055")
TR55IX - 7164 *Iridium Plug*

Heat Range 6

Plug Name - Stock Number - Factory Gap
TR6 - 4177 *Copper Plug* (0.035")
TR6IX - 3689 *Iridium Plug*

Heat Range 7

Plug Name - Stock Number - Factory Gap
TR7IX - 3690 *Iridium Plug*

Heat Range 8

Plug Name - Stock Number - Factory Gap
TR8IX - 3691 *Iridium Plug*

Optional Plugs, USE AT OWN RISK (I have heard of some F-Body guys using these plugs, so I thought I might list them) *See note below*

BKR6E - 6962 *Copper Plug*
BKR7E - 6097 *Copper Plug*
BKR8EIX - 2668 *Iridium Plug
BKR9EIX - 2669 *Iridium Plug


Note

TR* Plug Specs
14mm Thread
.708" Reach
5/8" Hex
Projected
Tapered Style

BKR Plug Specs
14mm Thread
3/4" Reach
5/8" Hex
Projected
Gasket Style


The OEM Factory Installed NGK plug is PZTR5A-15, the Stock Number is 7862, with a gap of .060" These are the $10 a piece Laser Series Platinum plugs.

 

Good info! I bet corey will like this one since its useful lmfao

 

Definitely good info, glad that you cleared up the mis-information that I got about the TR5 "replacing" the TR55

 

I just found this thread using the SEARCH button!!

 

good info man

 

Congrats!

 

OEM plug AC Delco Iridium 41-985 ( .040" gap)

 

Good Thread Scott!!

 

What's a search button?

 

stuck! Good job scott! It is about time you did something useful...