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09-04-2012, 06:54 AM

#8

TheYellaBrick

Senior Member

RACING JUNKIE

Join Date: Mar 2008

Location: Emmett, Idaho

Posts: 7,334

The plugs are going to read different with unleaded 10% than in the old days on leaded pure pump gas.

NOTE! You do NOT read the porcelain for Jetting !

"Ground Strap" = Heat Range
"Plug's Base Ring" = Jetting
"Porcelain" = signs of pre-ignition/detonation

EXCELLENT article;

http://www.angelfire.com/fl4/pontiac...Readplugs.html

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