Part record

Spark Plugs, 3V heads, one-piece updated (Motorcraft SP-546 / Ford PZK-14F)

All 3-valve 5.4L V8 and 6.8L V10 (Super Duty 2005-2007; F-150 2004-2008; Expedition and Navigator 2005-2008 - the same 3V engine, in the Navigator not marketed as Triton). The current Ford service plug PZK-14F - the catalog lists 'SP546' as its other name and supersedes the earlier one-piece SP-515 and the original two-piece plug family (PZT2F / PZT1F / PZH14F era). The ORIGINAL two-piece plugs (first 3V years) can break in half on removal, leaving the shell stuck in the head - if the truck may still run original plugs, plan on the removal tool (part-sd-broken-plug-extractor-3v) and Ford TSB 06152 removal instructions. After a proper one-piece update this becomes a routine service item.