Copper

 

Mine were cut to the right lenght and already put together.
Why are you ordering plugs from Summit? Why not get them from the parts store down the street?

 

at first it was just easier cause i was ordering the wires from them. but the wires arnt in stock, so im getting them at the local store, and ordering the wires.

 

I felt a clear difference when I replaced the factory plugs at 50k. You can't feel a 10 hp boost, so figure at least 20 hp. The originals were in really bad shape, some were missing the little puck on the ground electrode, huge gaps. I used regular Bosch platinums, cheap at Autozone. I ohmed the original plug wires and all were ~ 300 ohms, so I reused them. I have read that some guys tear up the wires removing them, but I was careful and got them off no problems.

 

NGK TR55s are a good choice for N/A and gap them around 55-58ish. I have the NGK TR6s gapped at 38 and they are also a great plug...especially for nitrous.

 

Spark plugs are PITA to change on LS1. AC Delco has an iridium plug which should last longer than $2 spark plug.

 

You are not going to get any hp gain with new plugs or wires. Sure we've all seen people get up on the dyno with new fancy $10 each plugs and show a few more hp - but most folks forget that it's easy to trick a car into gaining a couple points by letting it cool down fully, etc...

I get the $1.88 NGK TR55 plugs and they work just fine gapped at .050. I originally gapped them around .058 and the car broke up really bad over 5500rpm. I would never replace the wires unless one of them was damaged, it is a waste of money.

 

And since you said you've never done the plugs before, do yourself a favor and get #8 from underneath the car.

 

so which is it?...... 0.50 or 0.58 ??

 

.55

 

I agree with Greed4Speed, you don't need anything special, and avoid platinum+4's, +2's, splitfires, rapidfires, and any other gimmick out there like the plague. I always replace my plugs with AC Delco's. Your engine will love you if you put exactly what came in it back in, in your case AC Delco platinums. You can get any 8mm or 8.8mm low-resistance wire you like and you'll be fine. I've used the Accel and MSD wires and they both work like champs. An MSD box will help a lot if you invest in one.

 

Not with an LS1.

 

Dont you only need an MSD box if you have N20, forced induction, or some serious internal mods?

 

Not on an LS1.