Ford Performance M-12405-3V0A - Spark Plug Set 3V Cold 16Mm (8 Pack)

3V COLD SPARK PLUG (16 MM THREAD) This part supersedes Ford Performance M-12405-3V0 Fits 2005-2008 3V heads requiring the 16 mm thread For use in engines with higher than stock cylinder combustion pressures or sustained high rpm Unique design is proprietary to Ford 3-valve engines One heat range colder than the stock Mustang GT plug Two heat ranges colder than the stock 5.4L-3V truck engine plug Sold in engine sets of 8 Use M-12405-3V12MM spark plugs for 2008 and newer 3V heads Note: 2008 engines with late style 12 mm spark plugs can be identified by coil engineering number 8L3E 2005-2008 engines with early style 16 mm "High Thread" design spark plugs can be identified by coil engineering number 3L3E part number All 2009-2010 engines use 12 mm spark plugs