Gottahavels1

I just found out that some of my spark plugs are fried after having a mechanic take a look at my car. I believe I have NKG TR55's on there and he said to get new ones and mess around with the gapping. I'd rather just get it right the first time. What should i set the gapping at? also, what kind of plugs should I get? Its a bolt on stock ls1. thanks guys

question

iTrader: (2)

A lot of people will tell you different numbers on the plug gaps.
Somewhere between .033 and .050. Mine came gapped from Autozone at .036 I think.
I would just go with stock replacements or the TR55's, just my 2 cents.

LS6427

iTrader: (2)

Bone stock, any gap from .040-.060 will work the same, there is absolutely no difference in performance until you really gap them alot larger or alot smaller than thatdifferent.

Perfect, is .050 for bone stock. Split the difference.

TR55's or TR5's, they are both 100% identical plugs. JUst make sure you get a gapper tool and gap them yourself, regardless of what the clown at the auto parts store says to do.

Or at least check all the gaps to make sure they're correct and the same.

And when you put them back in, just put them in a tiny bit more than HAND TIGHT, put them in by hand spinning the spark plug socket, then use the ratchet to literally, barely, snug it on till it stops, then maybe a 1/8 turn of the ratchet. ((You'll thank me at your next plug change)) Use dielectric grease all over the spark plug head and shove a glob into each spark plug wire boot before you snap them on. No need at all for anti-sieze on the threads but it can't hurt if you want to.


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ghardester

I still like the AC Delco Iridiums, gapped the way they come, which is .50 I think.

km346

iTrader: (4)

Our cars came from the factory @ .060. However there is a TSB stating to gap @ .040 due to "rough" idling issues. Like 427 said anywhere in between is fine. I left my NGk's @ .055