spark plugs

[jodmari]

what spark plugs should I use since im going to lth's with no cats ,or stay with stock thanks

[pajeff02]

Either NGK TR55 or Delco Iridium spark plugs work great in our cars. NGK's are less expensive and will easily last 30,000 miles, while Delcos are more expensive but have a life span of up to 100,000 miles.

[theorangeguy]

Either NGK TR55 or Delco Iridium spark plugs work great in our cars. NGK's are less expensive and will easily last 30,000 miles, while Delcos are more expensive but have a life span of up to 100,000 miles.

any other perks besides the mileage? Im swapping mine this weekend...wouldnt mind using the delcos because they sound like a better plug. What do you run in your car?

[pajeff02]

TR55's gapped to .054".

[SMWS6TA]

I answered a post last yr or two about this subject and can't seem to find it. I had a lot of info in it and thought it was sticky but seems not so I'll try to answer what I remember.

Copper core plugs burn hotter and wider than most other plugs.

Goes like this: For high spark

Copper>Platium>Iridium

However for duration it's reversed.

Copper last about 25,000 miles
Platinum about 50,000-70,000 miles depending on design..
Iridium last about 80,000 -100,000 miles, again depending on design

Race guys love the copper vs the rest for a few reasons, mostly because high use of N2O will foul plugs quickly as well as high rpm runs with race fuel. IMHO it's cheaper in the long run to stay with copper core if you are continuously doing plug changes. Why run iridium when you're going to not make it to it's life span.


If you're using the car as a DD and very little street I would suggest using Iridium plugs for the mileage. Before I started heavy modifying I ran Iridium plugs in my bird. Now I stick with TR55's because I use it (or will be once it's back up) more for strip than DD.

OP don't forget to upgrade your wires as well. MSD are some great wires for all around. If you go with Accel get at least the 8.8mm. I use MSD as well as many others.

[0rion]

yep.....tr55's and msd wires here too.

[dethinboots]

tr55's for the win. plus they give me an excuse to tinker around under the hood more often. Probably not a good sales pitch but i like them.

[mrbvlo]

NGK TR55s and MSD wires. Found this a couple years ago on a forum somewhere, but it works for changing the plugs on a 4th gen LS1:

Starting on the drivers side this was my combo:
#1 and #3 swivel ratchet with 1" extension.
#5 swivel ratchet with 2" extension.
#7 swivel ratchet with 2" extension and swivel extension, swivel should be closest to plug socket.

On the passenger side this was the combo:
#2 and #4 swivel ratchet with 2" extension.
#6 fixed ratchet with 1" extension.
#8 swivel ratchet mounted right to the plug socket.

The only one I had to get from underneath was #8

Hope this helps

[pajeff02]

^^ The short extension is key. I think I used a 1-1/2" extension and that worked really well.