S197Seller listing
Listed price$114.99
View listing at Late Model Restoration; opens in a new tabS197 Mustang · Buyer's guide
2005-2008 Mustang GT 4.6L 3V Spark Plugs, Coil Boots and Broken-Plug Tooling
2005-2008 Mustang GT 4.6L 3V; Ford broken-plug procedure applies to affected engines built before 2007-11-30
Current seller options
WHERE TO BUY
Open an exact listing, then confirm fitment, stock, price, and shipping with the seller before ordering.
Seller links checked . Prices and availability can change.
S197Seller listing
Listed price$129.60
View listing at AmericanMuscle; opens in a new tabS197Seller listing
Listed price$12.99
View listing at Walmart; opens in a new tabS197Seller listing
Listed priceSee seller for current price
View listing at PartsGeek; opens in a new tabS197Seller listing
Listed priceSee seller for current price
View listing at Mustangmaniac co; opens in a new tabWhat you need to know
Mustang GT 4.6L 3V only, 2005-2008. V6, GT500, 2009-2010, and 5.0L applications are excluded. Ford TSB 08-7-6 requires a room-temperature hand-tool procedure and covers broken-plug extraction for affected engine builds.
OEM numbers
Checked current plug paths include Motorcraft SP-547 and seller-retained SP-514 naming. Ford TSB 08-7-6 identifies affected 4.6L 3V engine builds before 2007-11-30verify the cam-cover engine-build label before service.Supersession
No unsupported SP-514-to-SP-547 supersession is asserted. Seller naming differs, so the removed plug, VIN application, and current Motorcraft catalog must agree.
Fitment
Mustang GT 4.6L 3V only, 2005-2008. V6, GT500, 2009-2010, and 5.0L applications are excluded. Ford TSB 08-7-6 requires a room-temperature hand-tool procedure and covers broken-plug extraction for affected engine builds.
Aftermarket options
Exact Motorcraft plug listings and application catalogs were checked. Broken-plug extraction tooling is a contingency after following Ford procedure, not a substitute for the procedure.
Before you buy
Ford limits the broken-plug risk procedure to affected 4.6L 3V engines built before 2007-11-30; read the cam-cover engine-build label. Work only on a room-temperature engine and follow TSB 08-7-6. Seller plug naming varies; verify VIN/application and the plug removed.
Research and fitment sources
Supersede reviewed 8 unique research sources for this guide. 6 also appear above as a seller or official action and are not repeated here; 2 additional citations follow.
Research last verified .