3V SPARK PLUG 12MM THREAD
For use in engines with higher than stock cylinder combustion pressures or substained high rpm
Unique design is proprietary to Ford 3-valve engines
One heat range colder than the stock Mustang GT and 5.4L truck 3V engine spark plugs
Sold in engine sets of 8
Fits all late style 3V heads requiring 12 mm design spark plugs
Use M-12405-3V0 spark plugs for early style 3V heads
NOTE: Engines with late style 12 mm spark plugs can be identified by coil engineering number 8L3E. Engines with early style 16 mm “High Thread”
design spark plugs can be identified by coil engineering number 3L3E.
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