94m6Z28

did a serch, and looked aorund alot but i couldent really find any thing at all

soo ill just ask

stock lt1, bolt ons. 6-7psi

what will be some good plugs that wont need to be changed ever 50miles??

MY99TAWS6

iTrader: (3)

Almost all the new forced industion cars like new skyline run iridum plugs. So just run tr6ix.Maybe gapped down a bit. You can gap iridium just do it carefully.
APS recommends iridium ngk in my install manual. Tr6 are ok but you will be changing them much more frequently. They say not to run platinum plugs for FI or nitrous.

EPP

iTrader: (22)

We use the TR6 plugs, much less expensive and they last a good while if the tune is on. Bob

94m6Z28

what about any ac delco plugs?

Tiger2o69

iTrader: (16)

I use tr6 with no problems.

MY99TAWS6

iTrader: (3)

Tr6 are cheap but still if you have to change them a lot more than iridiums the price equalizes. And who likes changing plugs on the ls1 f bodies? Still annoying and more times you change out plugs in aluminum heads more chance you strip out a hole maybe. And with the money we spend on these cars hardly think a few more bucks for the iridiums means much. But whatever floats your boat. Tr6 are the most commonly used plug in FI and nitrous applications I would think if you took a survey.

COD02SS

Anything copper

94m6Z28

should i clsoe the gap a bit from stock?

i do belive the stock lt1 is set around .40.. i thnk

Websy21

iTrader: (34)

Not sure on a LT1 but for an LS1 .025 -.030 is about the norm.

ss_girl

iTrader: (9)

At what point should you go to a colder plug then the TR6?

Websy21

iTrader: (34)

Not sure if its more than a life term matter or a hp/cylinder pressure. All I can say is that I got me some tr7's for a better peice of mind.

HydroStream6

iTrader: (16)

I've been running TR7s gapped at .025" for 3 years now. I change them once a season and put about 8k miles on them each season. 650rwhp. I've ran TR6s also but they knocked a lot earlier. Perhaps it was a bad plug or something but I put TR7s back in and haven't turned back.

94m6Z28

just picked up a set of NGK iridum's. stock lt1 replacment, so its the same heat rateing as the stock AC plugs. will these last? or should i go for something colder?

BLNLS1/RX7

iTrader: (2)

TR6 always.

94m6Z28

so yah or nah on the NGK Iruds??

i bought a set of NGK Iridium TR55ix *is whats on the plug*. theses should work no problem correct?

MY99TAWS6

iTrader: (3)

Many factory turbo cars run iridiums now.They last much longer than cheap copper plugs .Do you really want to change out plugs often in your car? More chance of stripping plug holes in aluminum heads more times you do it.
You should go with 6ix for reasonable boost levels. The tr55ix are stock heat range.

ninetres

iTrader: (35)

Buy the TR6, NGK part no 4177 I believe. They are $15 a set and you should be checking/changing plugs on an FI car frequently anyway.

94m6Z28

so 55's are no good? and probly wont work well with a stock lt1 at 7psi?

MY99TAWS6

iTrader: (3)

They usually recommend one heat range colder which is 6ix in iridium and realized this is an lt1 car. Plugs are usually insanely hard to change on lt1 cars so would run the 6ix and you should be good for 50,000 miles maybe more. I doubt you will get more than 10,000 miles from the cheap copper plugs.

4SFEDZ

iTrader: (6)

im a ltx turbo car and run tr6's at 30 seems to be fine