Timothy Barth

I just replaced my original spark plugs with the recommended AC Delco.I also installed MSD wires . The plugs and wires had 28,000 miles on them. I was amazed the way the performance of the car picked up. I cant imagine these plugs lasting 100,000 miles. I guess it could be the new wires,but whatever the car definately runs a lot better.

66yellowstingray

I don't doubt it. This isn't a Honda 4cyl. Hi po engines tend to be rougher on general maint. parts. I don't care about running spark plugs to 100K on a Vette. I didn't buy this car to get out of doing routine maint. I already own a Honda.

I'm at 29K and I'll be replacing my plugs in the next few thousand miles. I don't mind spending $~70 every 30K miles or so to optimize performance.

C6 MoneyPit

I'm at 60K and it runs the same as it did when it was new. Same plugs, 3+ years and still firing. Maybe I will think about changing them and see if I notice any difference.

dumpster

You'll probably start seeing a MPG reduction before you feel a power reduction. By the time you feel a power reduction you went way too far with your plugs.

Shortimer

Good advice. Plugs and wires aren't that expensive and can make a big difference in how the car runs. Buy a good product and you'll be happy.

nwc6

I changed mine at 10,000 and noticed a big difference. Probably because two of the stock plugs were gapped at over .055...

fastter

dvilin

Interesting will not question your results, I am just surprised as this is the first I have heard of anyone changing the plugs and wires. You would think they would be good for the 100k as I am sure GM dealers would love to hit you up for them otherwise.

JERGENSEN LS3

If I wait till 100K miles to change plugs, it will be the year 2033

3 Z06ZR1

still firing yes, running as good as new? no
Your won't know anything till you change them.
100k plugs? Hogwash!

1yy07vette

I hope they last 100,000 miles , somehow i doubt it.

3 Z06ZR1

another thing no two plugs are gapped the same. factory
installed gaps are crap. they need at least regapped right away!

vettedoogie

How exactly did the performance of your car pick up? What specifically was different? Did you notice anything wrong with the original plugs or wires after you got them exchanged?

PS-What specific MSD wires did you use?

Justasheet

I was going to change my plugs until I saw a thread where someone was asking which was the best plug.

Everyone of course had their own opinion on that but Chuck cOW, the tuner on this forum and one of the most respected authorities on our car said that the best plug is the ones that came with the car and they would last on any vette for 100k miles even if they were moderately modified.

I wish I could find the thread.

He said that the hazards of doing damage with the change wasn't worth it.

I don't mean to speak for the man so you can research his comment for his exact words.

I am leaving well enough alone unless there is a problem with the performance.
Just my opinion, meant as a word of caution.
Jeff

mike100

I'd be tempted to regap the oem plugs after 2-3 years maybe, but I think the plug wire change is where some of the extra performance came in. re-gapping an old plug will help spark duration increase since less energy is spent jumping the gap (probably easier to just put in new ones for the time spent though). Different story for forced induction though...new plugs every 20k miles.

seevi

I was about to drive cross country and I thought about having the plugs changed after 30K miles and the shop I dealt with told me not to bother (as did the dealer).

Also, I heard that re-gaping the stock plugs has a tendency to break the grounding electrode. Comments?

Timothy Barth

To vettedoogie: With the change of plugs and wires the car acclerates much better when you stomp on it . To me it was very noticable and and I was a little bit surprised. I did not have the old wires checked and the spark plugs looked worn but not worn out.The new wires were MSD32813 superconductor.

Rocketmanwpb

I drove my 98 Camaro to 140,000 and I changed the plugs and wires at 99,000 miles when the engine started running rough. Up until that time there was no performance change or mileage change.

Eritosthenes

Almost everything we see in the way of "new and improved" spark plugs are without a doubt automotive urban legends. I believe the spark plugs in LSx (and most other contemporary high performance) engines have very long lived platinum electrodes. When fired by modern high-energy ignition systems and used with computer-controlled fuel injection systems, these spark plugs have expected service lifetimes vastly longer than those we may have grown up with in the era of carburetors/points/plugs/condensors '60s and '70s muscle cars. They should last AT LEAST 60,000 miles -- 100,000 miles should be the norm. If you change your plugs before then and see any MEASURABLE improvement in either power or mileage, then you almost certainly have something else seriously wrong with your ignition or fuel injection system.

vettedoogie

Thanks. It is always good to hear specifics.