Need new spark plugs - what to use w/ Cammed engine?

[Robert P]

I have a '00 LS1 with an LG Motorsports G5X3 cam. No other "real" internal engine mods.. No FI either. It makes about 420 rwhp. What spark plug should I use?

I have TR55's in it and I was wondering what I should go with next - and what should I gap them to?

The TR55's in there now have been there for about 2 years.

[BIG D's SS]

Stay with what you have and just replace them with new ones.

[BIG D's SS]

Stay with what you have and just replace them with new ones.

[ninobrn99]

agreed. i however will be running tr6's with my cam only ls1. i wanna see if that aleveiates my issues with the slight knock im getting.

[johuckabee]

just use a good plat. flush electrode and it will do everything you need it to do. those multi-prong plugs don't do anything. gap gap gap, don't forget.

[Robert P]

. gap gap gap, don't forget.

Whatcha mean? What gap should i use for a 420 rwhp cammed engine?

[johuckabee]

Depends on a few different things. Plug wire resistance, coil packs, ignition head unit, and the plugs you ultimately choose. To big of a gap will down cylinders. Stock plug gap is .060 to .065 with OEM plugs. The plug manufacturer is the best resource for this info. They will be happy to help.

[SLOW346]

Stock gap is .060. The TR55's come gapped at .055, and most people leave them there. They should work well gapped anywhere from .050 to .055.

[Sarge]

I had a few issues and ran NGK TR6's gapped at between .035-.040 and voila...no more KR issues....of course I blew that motor up but by golly it wasnt because of the plugs

[gen3toy]

oem plugs will be fine and no need to gap beyond specs,makes no difference if u have cam only set up or stock

[Robert P]

I had a few issues and ran NGK TR6's gapped at between .035-.040 and voila...no more KR issues....of course I blew that motor up but by golly it wasnt because of the plugs

Thanks guys!

I called LG Motorsports and talked to Bobby and Anthony the other day about which ones to use. They said to use TR6's gapped at .040. I appreciate all the input...

-Robert