spark plugs

[Damien2003]

what r some good performance sparkplugs to put in a stock the merc ?

[fastblackmerc]

NGK TR6 or TR55. TR6's are cooler plugs.

Search the site, has been discussed before.

[merc]

what r some good performance sparkplugs to put in a stock the merc ?

What does Merc run in his merc,I run Autolite Cooper Core spark plugs.

http://www.autolite.com/images/wtbResized/copperCore0.jpg

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Advance Auto Parts http://www.advanceautoparts.com/
Auto Barn http://www.autobarn.com
AutoZone http://www.autozone.com
CARQUEST http://www.carquest.com
Fairfax Auto Parts http://fxautopartsonline.com
Magic Mart http://www.magicmartstores.com
NAPA http://www.napaonline.com
O'Reilly Auto Parts http://www.oreillyauto.com
Parks Auto Parts http://www.parksautoparts.com
Pep Boys http://www.pepboys.com
Salvo Auto Parts http://www.salvoautoparts.com
Summit Racing http://www.summitracing.com
Wal-Mart http://www.walmart.com
Walker Auto Stores http://www.walkerautostores.com

[captain]

I went back to OEM. me and the beast like em best. At least in Minnesota.
When summer comes...I will re-install the TR5's for fun. Ask me again in August.

[RF Overlord]

Damien, if your car doesn't have a tune there's absolutely no advantage to running other than the stock plugs.

[Breadfan]

Damien, if your car doesn't have a tune there's absolutely no advantage to running other than the stock plugs.

I agree with this statement as well.

As with merc I run copper plugs, I current have Motorcrafts in which I believe are the same as the Autolites I just can't recall how the part #'s matchup.

[Damien2003]

thanks 4 the info.

[ctrlraven]

NGK TR6IX plugs with tune and 180 t-stat.

[red]

Motorcraft updated part number for the one step colder plug is SP505 (old number was AGSF22C). Advanced Auto carries them for less than $2 each. According to Rock Auto, the stock plug part number is now SP447 (formerly AGSF32C). As others mentioned, stick with stock until you're tuned.

[Taemian]

Motorcraft updated part number for the one step colder plug is SP505 (old number was AGSF22C). Advanced Auto carries them for less than $2 each. According to Rock Auto, the stock plug part number is now SP447 (formerly AGSF32C). As others mentioned, stick with stock until you're tuned.

By "tuned", does that include Lidio's Xcal2 tune? I have that and a JLT CAI.

[Blackened300a]

Im running the Denso Iridium IT20 plugs. The only difference was it made my wallet $110 lighter.

[RF Overlord]

By "tuned", does that include Lidio's Xcal2 tune? Any time the fuel or spark tables are altered, that's considered a tune. I would ask Lidio directly if he recommends other than the stock plugs with his tunes. I know Dennis used to, but I don't think he does anymore.