Patman

I changed my spark plugs on my C5 this morning and it got me wondering as to how the spark plug change on a C6 compares? I know there probably aren't a lot of you who have done a plug change just yet, but I figured some of the modified ones might have done it.

I find the plug change on the C5 to be relatively simple (can do it in under an hour no problem), and was hoping it's the same on the C6.

haljensen

The C6 with either stock manifolds or headers is EASY! I was able to get a torque wrench on every plug. The C6 is much easier than a C5 because the back plugs aren't hidden under the firewall.

burtonbl103

Verry easy to do

What wires are you going with ?

cbrf4i1

very easy to do.

Patman

I need to get a C6 first!

I would probably stick with the stock wires until they had about 50 or 60k on them though, then switch to something else. What plug wires have you guys found to work best on the LS2?

excessive81

i got ngk from lg and taylor 10 mm wires. they are sick

Patman

Do the NGK TR55s fit the LS2 or have they gone to a different size and/or heat range now?

LS WON

Need to replace with Iridium spark plugs.

Zig

don't have to use iridium plugs if you don't want too, however, iridium plugs last longer between changes. if i recall correctly, iridium plugs are rated at 100k miles.

LS WON

Platnum is also rated to 100,000 miles or did that change now?

NineBall

I use TR55 plugs for all-motor applications, TR6 plugs for supercharged/turbos. Super easy to swap them in a C6.

LS WON

NGK's copper?

Patman

I use the NGK TR55 coppers in my car too, I see no point in going with platinums or iridiums if I'm changing them so frequently (the plugs I just removed on the weekend had only 17k on them) I would much rather go with copper plugs and change them once or twice a year, as opposed to going with platinums or iridiums and leaving them in for 5 years. They'd be practically welded into the heads after that long!

Another thing I don't like about platinum plugs is that they are slightly more prone to detonation. So you'll get a degree or two more spark retard with them compared to copper.

shopdog

Iridium and nitrous don't get along together very well.

LS WON

Changing spark plugs in C-6 is it that easy? Also do coils have to be changed? What about spark plug wires too?

0Doug@MorosoPerformance

Platinum plugs will last longer but standard NKGs will burn better giving a little more power. Due to the headers on my C5,changing plugs is about three hours of hell, but I still use NGKs. My other car get platinum,and they are easy to change.

You do not need to change coils or wires with your mileage.

LS WON

Changing those plugs on your car sounds like the 454 with air cond nightmare.
When does one usually change coils or plug wires?

Patman

You won't make any more horsepower with platinum plugs than you would with copper plugs. If anything you'll lose power, because like I said earlier, you're more prone to detonation with platinum, so on hot days you'll see more spark retard.

LS WON

for the info I guess that's why on my other car I switched back to what was called for from the factory which was at the time copper plugs and removed the Bosch +4's platniums.

Black06C6

IMHO without aftermarket mods or a reprogram to the micro P this is not a problem. The micro P, coupled to the knock/temp/02/and other sensors, has enough width in the program parameters to comp for the slight variance afforded by temp swings, octane, and density altitude variance (including hi/lo humidity). Since the benefit of the iridium/platinum anode/electrode combo is both durability and controlled pin point spark performance, a change to iridium should yield no loss of either HP or MPG.

Although I've not pulled my OEM plugs (my C6 is only 8 mos old with 5900 miles), I'm guessing the folks at GM/Corvette put platinums in from the factory. Most performance engines, those looking for 92 and up octane ratings, from either the US or off-shore, are coming from the factory with platinums now.

For me, the only reason I'd pull my plugs is to check the gap. The folks at the factory are known to miss the hole while inserting the plugs and closing the gap a little when the plug hits the head while trying to find the hole. I also check to see that the anode is centered over the electrode to ensure maximum spark exposure causing consistant fuel/air ignition. Bosch has a nice plug geometry in either their platinum 2 or 4 anode design. For a street engine, no, I do not index the plugs - that's reserved for those that need the max in performance.

Does anyone know what type and brand (AC/Delco would be a 99.9% sure bet) are the OEM plugs?