SSpade99

Should I stick with AC delco? or somthing eles and how often are u supposed to replace them in the LS1's? every 24,000 miles?

LS6427

iTrader: (2)

I've tried them all, even the exotic 4 electrode ones. Its all hype.

I use NGK TR55's, they are the best ones. But your engine was designed with AC Delco's, so they will be perfect.

Even with stroker engines, just use NGK or AC Delco. You won't get better performance with any others.

Change them every 50,000 and you'll be fine, unless you have certain issues internally.

Black 99 Bird

iTrader: (31)

Stay with the NGKs

krazy4

iTrader: (5)

NGK TR55 for N/A
NGK TR6 for a small shot

Formulated

iTrader: (16)

AC Delco is good. NGK is great, and so is Denso, but Denso tend to be more expensive.

A lot of these plugs are hype. A traditional j-gap plug with an iridium electrode will last a really long time, and perform extremely well.

mike#9

iTrader: (3)

I use TR6's for my H/C car. They seem to work good.

Z28/2002

iTrader: (27)

Most guys run NGK plugs

Mean87SS

iTrader: (21)

true

Hard Core Z28

NGK for $2.00 is all ya need.

JScamaro

iTrader: (6)

I am running the AC delco ones while I'm bolt on but plan to switch to the NGK TR6 once I install my H/C and nitrous.

*98TransAm*

NGKtr55

HMERacing

My car came with Denso Iridium stock but When it was time I switched to NGK (not Iridium)

1FST99Z

iTrader: (9)

NGK's here

snake charmer

iTrader: (118)

NGKs all day . i run a tr6 which is a step colder but that is beacause of the power it is making now . ran the tr55s for a few years with no problems .

adam02gt

iTrader: (1)

I just bought some ngk's for mine thats all i've ever run in any car I've owned.....

MYSTIC-1SC

iTrader: (14)

I had denso iridiums, but swapped in ngk tr6s for the nitrous

Randy WS6

iTrader: (69)

NGK's here TR6's

ChevyRyda99LS1

tr55 here

jrocstar

iTrader: (31)

autolites! absolutely love them for boost

69lemansguy

iTrader: (12)

NGK tr55 with MSD 8.5 wires.