So now that I've got the rockers coming should I plan to swap out my NKG TR55 IX plugs?
I want to stay with Iridium plugs and don't mind paying the premium.
Are the TR6 the ones to go with? Do they come in Iridium?

TR6-ix heat range 6 cold
TR7-ix " " 7 very cold
TR8-ix " " 8 ice cold
you have to regap the first three
TR55-ix " " 5
ITR6F-13 " " 6 (gap is set at .052)
iridium center electrode
platimum tipped ground electrode

ROD

DENSO plugs
IT20 gap .044 heat range same as TR6-ix cold
IT22 gap .044 heat range same as TR7-ix very cold
IT24 gap ? heat range same as TR8-ix ice cold
IT27 gap ? heat range dry ice
ROD.

Hey, Rod. I just noticed how darn close our 1/4 mi times are.

So what are you really saying?
You really aren't helping me choose which ones to switch to.....or should I just stay put and pull them after a while to see if they are fouling or burning ??

I would buy just one denso IT20 regap it to .050, put it in the front cylinder. Drive it for 100 miles pull it and look at it. That'* what I did when I bought my NGK'*. The reason I would choose Denso is because the center electrode is smaller than the TR55IX NGK'*.


ROD

SSEi95 got some denso'* in August, and he told me they were great, and he got a nice gain. I don't know his plug situation before though.

So smaller is better?
Are the Denso'* iridium also?

yes, the DENSO plug is iridium and smaller is better for the center electrode.
DENSO also has the U-GROOVE design on the ground electrode.


ROD

I can't find anyone around here that sells them.
I think I'll stick with the TR55'* for now.

sparkplugs.com
they got em. and a whole lot more
check it out
go to advanced tuners
THREAD SIZE 14MM
SEAT tapered
REACH .708
HEX 5/8"
TERMINAL TYPE all
RESISTOR
GAP all
HEAT all
U PICK THE MANUFACTURER
GOOD LUCK HAVE FUN.....

ROD