Spark plugs

[Cobra]

Hi All
Replaced the OE AC plugs at 100K with the Same Stock plug
The OE looked VERY good with 100K so why change if it is not broke
do not try to fix it

Did min around 77k and yup those stock ones looked great. So stuck with OEM ACDelco Iridium spark plug. I kept hearing from everyone that is what are engines like best. I did change wire to MSD 8.5

 

[Redhoe01]

So do we need Iridiums for our trucks?

 

[TERRYCCTT]

the plug that is best for these trucks are the acdelco 41-110 i think is the number. they are iridium and were made by ngk so the ngk plugs are good. you can however use a resistor plug for more power. champion is mainly used on chrysler and lawn mowers but are ok. autolite isnt too bad but i wouldnt use them on anything i have. bosch is the worst plug known to man and ask any mechanic or tech at any shop. i have changed more bosch plugs between the day a person puts them in to about 60k miles. they never burn clean and foul quik. i use the oem plug with msd coils and wires.

 

[t_ahan]

oem plugs

when i installed msd coils the truck felt worse and after talking with the tech i went with what they recommend which is msd coils and msd wires with the acdelco plugs!!!! runs great with the bbk throttle body and headers ...but im going to see what happens when i disable the torque management with the diablo sport!!!!...OEM PLUGS ALL THE WAY... our trucks are picky with plugs trust me im a service manager and tech and i have had to warranty customers plugs cuz something other than acdelco was in the truck and made them run weak..jus my 2cents

 

[puckhead]

NGK TR-55

NGK TR-6 for Nitrous

+100

and gaped at .04

 

[bravo2]

How many are using ac delco gapped at .04 and also using msd 8.5mm wires and msd coil? I am about to change my plugs and wires so like to know before i do them.

 

[t_ahan]

msd is bad

i have not had good luck with the msd coils and wires...oe coils and wires r best....i jus ordered 2006 vette z06 assembled heads and cam,lifters,push rods with comp rockers ....i hope it will work on my lq4

 

[bigg]

""""""""""" e 3 """""""""""""" plugs

 

[t_ahan]

e3 ..u think they will help msd problem

my msd coils keep going bad and start misfiring....i have tried numerious solutions....plugs wires new set of coils...bought everything msd tech after a 5 hr walk through on the phone thought could work and still happened...i feel the factory set up really lets my truck pull and runn hard all day every day...i drive it pretty hard and it is mos def reliable with the oem ignition with the mods i have!

 

[Slammedchevy01]

So the OEM ACDelco Iridium spark plugs are the OEM factory for my 03 tahoe 4.8? I got 80k and it has a little miss and the shop recommended changing the plugs. Sound about right for 80k?
Are these them? Anyone gap those to .04 yet???
http://cgi.ebay.com/ebaymotors/8-AC...ptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccessories