THE-FALCON-C5

Im going to be upgrading the ignition system on my vette and I was wondering what the best spark plugs, and coil packs would be?

neutron82

stock coils in most cases and spark plugs depend on what you're doing to the car, you have to be more specific

THE-FALCON-C5

im looking to add more power to make the daily driver more fun, not tracked and not raced, just driven for fun i guess.

My Vette Life

cheapest way to add power is sell the stock engine and replace with a used ls3.

Back to the plugs: stock for your driving habits

Stingroo

Leave them alone. And don't buy aftermarket junk plugs or coils, either. They are all crap. AC delco iridium plugs, stock coils, and plug insulators for the wires if you have headers and feel like going that route.

You could get the truck coils as a slight upgrade, but the difference for the money is nearly nil. The ignition is not a weak point on an LS engine at all.

Evil-Twin

You will not gain any power replacing the stock plugs, or coil pack unless they are defective. But then, if they are you will only regain what you have lost. If you are running way outside of the design in a full blown track car you would benefit by a colder plug ( but only for plug integrity ) . You want more power, get a tine. there is more stock horse power to be added in a custom tune, even on a stock car. I would not waste a tune unless you are not planning to add any real modifications.
A tune on a stock car is worth the money but its more valuable if you are adding performance mods first then spend that money on a tune.
Bill aka ET

smitty2919

Simple TR6 plugs and MSD coils.

Or since it's a stock car and DD, just use AC Delco stuff.

neutron82

msd coils are crap and tr6 plugs are good for certain applications, like I said we need more info and he was still way too vague... "adding more power" could be 20hp or 300hp, how are we supposed to guess his mods or goals

road pilot

Gaining power is not as simple as you think.
Adding a colder or hotter plug is not going to
cut it. Power costs money (and time and energy)
,if you want more power , think in terms of thousands
of dollars. Stay stock, if you are not ready for a comitment.
Good luck

strand rider

I don't mean to insult, but just in case, despite the advertising, spark plugs do not add power, and the same with the coils.

GM is known high quality stuff, they have a tremendous financial exposure to make sure the stuff works that the after market doesn't have. GM probably spends more on development to match the components together , although few cars today are picky about spark plug brands.

I am planning on checking my coils for function one of these days , and replacing any that have gotten old and out of spec. Not because of high skills, I saw a hot rod tv video where the wave forms from the coils on an old c5 they were working on had a different wave form than the new stuff, so I assume some were out of spec on that car. OF course, it was sponsored my a company that makes coils, so a multimeter test will set me right. If I need one or two , GM would be my choice.

Changed the plugs and wires on my used car soon after I got it, just to have a baseline of how old that stuff was. The old plugs looked good , but had the old gap on the plugs. With the new plugs and the tighter gap, my idle smoothed out bit.

I didn't know to mark the wires as I replaced them, they are all different lengths, , but not by very much.

dragls

lmao...

Impulsive goat

I had the MSD coils on a 2002 ls1 Camaro back in 2008 and they failed. Replaced them with stock units and no issues. I’ve now had 3 LS powered vehicles, all modified and all ran fine with stock coils.

Jistari

Yup

Stingroo

Also FWIW - NGK makes AC Delco Iridiums. You can go either way on that - just buy whichever one is cheaper/on sale. Same thing.