Genuine NGK AP5FS x 10 (10 Pack) Standard S/P Ford Gas Engines 144.170 CU.IN.
The NGK AP5FS spark plug is a relatively old-style plug, characterized by its 18mm thread diameter and tapered seat. This combination of specifications means it is primarily used in classic, older, and vintage vehicles, particularly those from the Ford range, as well as some industrial or small engine applications.
The most common applications are in classic Australian and US Ford models from the 1960s, 1970s, and early 1980s, often with 6-cylinder or V8 engines:
Ford Falcon (e.g., XP, XY, XA models)
Ford Fairmont
Ford Fairlane
Ford Mustang (Early models with specific engines, like some 289ci V8s)
Ford Cortina
Ford F-100 and F-250 Trucks
Important Note: Because the AP5FS is a plug with a less common thread and seating style than modern plugs, it is crucial to confirm fitment with your exact year, make, model, and engine size to ensure you are using the correct replacement for your vehicle.
The code breaks down as:
A: Thread Diameter (18mm)
P: Projected Insulator Type
5: Heat Range (A mid-range heat rating)
F: Thread Reach (10.9mm or 7/16")
S: Standard Construction (Copper core)
 
For FORD COMMERCIAL & INDUSTRIAL COMMERCIAL, STATIONARY AND GAS ENGINES 144, 170 CU.IN. OTHER