jimmyLSX

I have an 03 z06 with 53k miles and I believe it has the oem spark plugs. (Im only getting 24mph highway) I was wondering what are the best spark plugs?, after a recent run through of the search function I find that NGK TR55 are favorable but im curios as to which ones?

NGK TR55 V powers?

NGK TR55IX iridiums IX?

NGK TR55 1LX?

NGK TR55 GP G power?

are their are any other recommendations?

thanks.

3boystoys

Stockers work fine. Maybe the problem is your foot?

Ohyoufan

I just have the V-Powers in my car, I've used them in my WS6 I used to have too and they worked fine in both applications. The V-Powers are copper plugs though so they don't last near as long as the others, but since I have headers and all of my emissions deleted I can do a plug change in about 20 mins so I just kept running the coppers. At one point I had the pricey AC Delco Professional Platinum's in the WS6 and I felt no difference in the TR55's and the Delco's. Maybe go for the TR55 Iridiums so you don't have to change them as often?

strand rider

Get the iridiums. The performance is what the engineers expected when they designed the engine. REpeating what others have posted, no plug will give you a performance advantage, the lean burn design leaves no extra fuel , unlike older fuel system designs where ignition was less precise.

I put in the GM iridiums, and they have a small rebate through Aug. The NGk might be a better choice as they are coated to use without anti-seize. THe iridium advantage is the service life. In this engine, that is the only variable with plugs. THey either work or they don't.

I use a lot of qualifiers because I am repeating information from others posting here with higher skill levels. My skill level needs work. I also bought some wires and to my surprise, they were all slightly different lengths. I just put them on, figuring that electricity travels at light speed, so not much of an assembly error. I had to look up the firing order before I could put the wires on as designed.

The guy who runs the copper plugs just likes working on his engine. I am solidly pro fun, and if that is what he enjoys he certainly selected the right car. I guess if you could work on it more if it were an Italian design, but the parts would cost more. I always go for the less labor intensive upkeep strategies.

strand rider

Get the iridiums. The performance is what the engineers expected when they designed the engine. REpeating what others have posted, no plug will give you a performance advantage, the lean burn design leaves no extra fuel , unlike older fuel system designs where ignition was less precise.

I put in the GM iridiums, and they have a small rebate through Aug. The NGk might be a better choice as they are coated to use without anti-seize. THe iridium advantage is the service life. In this engine, that is the only variable with plugs. THey either work or they don't.

I use a lot of qualifiers because I am repeating information from others posting here with higher skill levels. My skill level needs work. I also bought some wires and to my surprise, they were all slightly different lengths. I just put them on, figuring that electricity travels at light speed, so not much of an assembly error. I had to look up the firing order before I could put the wires on as designed.

The guy who runs the copper plugs just likes working on his engine. I am solidly pro fun, and if that is what he enjoys he certainly selected the right car. I guess you could work on it more if it were an Italian design, but the parts would cost more. I always go for the less labor intensive upkeep strategies.

RedZMonte

V-Power=Copper ~30K mile life
G-Power=Platinum ~60K mile life
XI= Irridium ~100K mile life
LI= Laser welded Irridium ("Better quiality" irridium)

I would run stock unless your well modified (s/c, Turbo, heads/cam/exhaust). and a good set of wires.. I have OEM Delco Irridium plugs and GMPP 8mm wires). Boosted/modified cars seem to like Copper plugs maybe someone can explain why.

racebum

stock should be a denso plug

you can either get that or the easier to find ac delco 41-110 and or the ngk 55ix

LSOHOLIC

TR6..... Ftmfw !!

.

c5 yellow convert

[QUOTE=RedZMonte;1584594815]V-Power=Copper ~30K mile life
G-Power=Platinum ~60K mile life
XI= Irridium ~100K mile life
LI= Laser welded Irridium ("Better quiality" irridium)

I would run stock unless your well modified (s/c, Turbo, heads/cam/exhaust). and a good set of wires.. I have OEM Delco Irridium plugs and GMPP 8mm wires). Boosted/modified cars seem to like Copper plugs maybe someone can explain why. Copper and silver dissipate heat and prevents pre ignition especially on boosted and modified motors

c5 yellow convert

[QUOTE=c5 yellow convert;1592563038]

c5 yellow convert

[QUOTE=c5 yellow convert;1592563095]. Using plugs other than copper or silver can result in pre ignition especially on boosted motors The other plugs hold the heat and can cause the dreaded pre ignition I believe in ac delco plugs and wires, I have kooks long tube 1 /3.4 primary tubes comp cam cai BBK intake and throttle body on stock c5

My Vette Life

thats right Stock are Denso's 5077 plugs gap set at 60.

Great plugs for stock, I do say there's a minor difference between the IX55 and denso's.

Denso's will perform a tad less then the IX55 but if you want stock for a good clean fuel burn then denso's the best. I had the IX55 and had tons of gargle and back-fire with my straight pipes, its fun for a while but then get annoying and I don't want to attract the cops lol

Bob Chapman

I have used Bosch Platinum Plus 4 plugs in my 02 for years and in Mustangs for years before my Vette. Never a problem. I always change at 50,000 miles.

c5 yellow convert

Thanks for info. I bought stock plugs titanium tipped could not get plug wires thinking of Morosso?

Vetteman Jack

I'd recommend the AC Delco Iridiums. They work very well in an LS1/6.