Confused

[rajiv1998]

Ok so i went to the dealer today to ask a question about plugs. It seems that every1 has been telling me wuts the gapping of the plug so i went to the dealer and asked. He said the iridium plugs should be .040 Does that sound right for a 98 trans am? Iv been told .050,.060,.040 etc... The dealer said .040 but every1 says run .050 I gotta get them in ASAP cuz i got finals nxt week. HELP??

[rajiv1998]

can i run these w/o any problems. http://www.lmperformance.com/4793/1.html

[joejenkinsglass]

under the hood it should say on the sticker that says 5.7 liter also has a diagram or something

[2001NBMZ28]

I completely understand your confusion. My car came with Denso PTJ16R15, their site and my owners manual says .060. Been running NGK TR55 V-Power at .055 cause everyone said to do it - no issues at all. NGK's site originally said .060 for my car and .050 for '98 - recently they changed the gap on their site to .044 for the same plug. Emailed them and asked if they changed the plug. Their response was they changed the gap on their site because GM recently changed the gap on the plugs they get from their supplier, BUT the plug hasn't changed at all and "If you've had success with the stock gap don't change it." So they come gapped at about .059, if you look it up on their site says it should be .044 - so I'm confused too. Going to put Denso PTJ16R15's back in next change. Shouldn't be this hard...

[rajiv1998]

well iv place the order from thunder racing. I got the NGK TR55IX Iridium plugs. They say a stock LS1 gap is .050, so thats the ones i bought. I hope it will be ok, i know wesman has them on his car. Installation isnt bad, just time consuming. I need a nice day to work on it. Gonna let the car sit overnight and get to work first thing in the morning

[2001NBMZ28]

Just went to NGK's site for those plugs and the part finder says .044 for your car - wonder what gap they are out of the box - let us know when you get them.

[rbrtlux]

this thread made me think of a question if anyone could answer. i bought a bigger cam Lunati 231-231,598-598,112LSA and was wandering what the type of plug should be? and should gap stay the same as stock?