Direct replacement for 4.6L and 5.4L 3V engines equipped with 8L3E coils and 12mm spark plugs.
Required when installing Ford Racing heads M-6049-463VP3, M-6049-N3V, M-6049-N3VPA and M-6050-463VP3, M-6050-N3V, M-6050-N3VPA on 2005-2007 and early 2008 Mustang GT originally equipped with "High Thread" design heads.
Engines with late style 12mm spark plugs can be identified by coil engineering number 8L3E. Engines with early style 16mm "High Thread" design spark plugs can be identified by coil engineering 3L3E part number.
Note: Does not fit 3V heads with "High Thread" design spark plugs.
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