cablebandit

iTrader: (37)

I figure this will come in handy for some searching later

We all use NGK tr6s.
In the past I have used and recommended Autolite 103 as a substitute. After researching today, I find that the 103 is NOT a substitute...as a matter of fact it cross references to a NGK tr5 which I ASSume is hotter than stock! The tr6 does cross reference to a Autolite AR103......which is a "race" plug. So remember 103 and AR103 are 2 different plugs Autolite offers but the AR103 is the correct sub for a NGK tr6. Hope someone will find this useful.

Is a tr5 indeed hotter than a tr55?

Pro Stock John

iTrader: (34)

I was always told that the TR5 and 55's only differ in terms of in-the-box gap.

I'm currently running TR8's gapped around .030. I also have a set sets of Autolite plugs that Kurt@W2W suggested, I have tended to alternate. I just warm up the car, do my burnout, and then clear them out in neutral.

cablebandit

iTrader: (37)

ahhh...ok...prolly right.....either way...103 is not what you want for FI.....ar103 is correct or tr6 for most peeps

MIGHTYMOUSE

iTrader: (59)

hmm.. ya thats news to me

i have used all 3

kp

iTrader: (34)

102 autolite is a TR-6 I think.

TR-5 and 55 are just different gaps, same heat range.

cablebandit

iTrader: (37)

check it for yourself peeps...i want to make sure people get the right info I know I dont need stock heat range with 15 psi and 20deg of timing