high n dry

iTrader: (18)

Both r good.. I ran autolite 103's in my gtp back in the day, they worked well. I run NGK in my ws6, just pulled, they look new... Thats with 5k miles on them too.
Users choice

1320Chicken

iTrader: (4)

Same here. I only prefer the autolites because they're cheaper though. I noticed no difference from brand to brand in terms of performance, idle, or life.

2000ultraZ1911

If ur stock I'm more of an oem guy just get delcos if not ngk but what are you gaining on a stock car lol? Just deff no autolite bull

mark21742

I've never got a bad autolite out of the box....ive seen countless ngks new out of the box that were bad....autolites arent junk

1BAD98LS1

iTrader: (33)

I Run only NGK TR55's, TR6's and TR7's here. Have had no issues...

SteelCityYaga

Anyone run Autolite AR103 for a heads and cam (11.0:1 CR and higher) LS1? If so, how did they do?

mark21742

I do...12.5:1 scr with 8.22:1 dcr on 92/93 pump gas 408 stroker and never had any sparkplu issues

sabersaw30

iTrader: (10)

Switched from the tr6 ngk to autolite 103. Will never go back to ngks. Thanx for the post.

Black00SS/65SS

iTrader: (2)

Nod to the ngks here... never had any problems with them

2000PewterT/A

NGK, never had a issue, run them in everything I own.

willizm

iTrader: (10)

NGK b8efs's here.

JakeFusion

iTrader: (7)

If you have a forced induction or huge shots of nitrous, I'd go with a Denso Iridium plug. Start around an IT22 or IT24 and see. IT16 is stock heat range and IT20 is equivalent to a TR6. I thought about doing IT20s for my car... maybe next time.

TheWolfMatt

I pulled my TR55's from my 5.3 a couple of weeks ago, they had about 40k or so on them and they still looked new. I'd run NGK's but a spark plug is a spark plug, as long as the damn thing works.

wildcamaro

iTrader: (15)

Delcos--->which are made by NGK

2000ultraZ1911

^^ I hate when that happens....
Lol