which spark plug give more hp
 

can anyone tell me which spark plug they recommed for a 2002 3.8 n/a i'm using thr orginal ac delco let me know.

Continue using the double platinum AC Delco, you could upgrade to Iridium if you wanted, but stick with AC Delco.

stay with the stock plugs / wires (meaning replace them with new versions of what you have)

in theory, a copper plug will give you the best spark as copper is one of the best conductors. the drawback: short plug life. around 10K or so. that's why platinum and iridium were developed, for longevity. in the end, even a copper plug will give you a minimal gain if any. stick with the stock plugs or an OEM equivalent.

There isn't much fancy to a spark plug. Sure, its where the spark comes from, but don't make it much fancier than that. There isn't a lot going on there. The real power comes in the way of air and fuel going into the cylinder, aka heads, intakes, superchargers... there is some to be found on the bottom end too. Just go to the parts counter and get the best set of AC Delco plugs and wires you can get.

All the GM performance V8's make best power with NGK tr55 for NA and NGK tr6 for boost they r 2 Steps colder then the NGK TR55. i know a lot of the colbolt SS and GTP guys run the NGK tr6's so ya same motor as GTP

thank i run msd 10.8 mm wires they work great i was thinking of changing to the e3 plug but have mix reviews some say i doesn't give u much hp others say it works great.

Stock plugs and stock wires are all you are going to need. You won't be gaining any power from going aftermarket. Aftermarket wires will be just for looks, unless you get the PRJ wires, because those boots work great and allow quick changes.

I love my PRJ's, but unless you're running a copper plug and changing them often, there really isn't much point.

As the others have said- stock platinums are the way to go, you're not boosted so IMO there is no sense in going copper. It sounds like you're trying to gain a little power- you need to look elsewhere for a power gain, its not going to happen in the ignition system. You didn't gain any power with the huge MSD wires either- whatever money you spent on them over a stock wire or basic stock replacement was wasted.

index your spark plugs for the best gains.