Seal combustion pressure and control oil on the cylinder walls with the Sealed Power Piston Ring Set E-251X10, a premium-grade set for eight-cylinder rebuilds. It fits many vehicles, among them the 1975-1995 Ford F-150 (V8-5.0L), 1977-1996 Ford F-150 (V8-5.8L) and 1986-1995 Ford Mustang (V8-5.0L).
Sealed Power application-specific components are made for the dependability engine professionals rely on and are designed to help restore engine performance during a rebuild.
- Bore sizing: 0.010 in oversize, listed for a 4.0000 in bore diameter, with ring groove widths of 5/64 x 5/64 x 3/16 in. This is not a file-fit set.
- Top and second rings: The top ring is grey iron with phosphate. The second ring is grey iron with phosphate coating and has a reverse torsional face design.
- Oil ring: 3-piece flex vent design, 0.1875 in wide.
- Build quality: Sealed Power uses leading-edge materials and ISO- and QS-certified manufacturing to exacting tolerances. The set is built to OEM specifications or better.
Piston rings seal the gap between each piston and its cylinder wall. They hold compression and regulate the oil film on the cylinder wall. Signs that a ring set may need replacing include rising oil consumption, blue exhaust smoke, low compression or excess crankcase blow-by. Diagnose the cause before you replace the rings, because other engine components can produce similar symptoms. One set covers eight cylinders, and the listed applications use one set per engine. Country of origin: United States.
The set fits many vehicles from American Motors, Buick, Cadillac, Chevrolet, Dodge, Ford and more. Those applications cover engine codes V8-4.7L, V8-4.9L, V8-5.0L, V8-5.3L, V8-5.4L, V8-5.7L, V8-5.8L, V8-5.9L, V8-6.0L, V8-6.4L and V8-6.6L. See the "Vehicles it fits" section for the full list.
Interchange: R40058-010 · 50564CP.010
R40058010 · 50564CP010 · 139010 · H251X010
This part cross-references / interchanges with the following part numbers:
R40058-010, 139010, H251X010, 50564CP.010
Frequently Asked Questions
What size is this piston ring set?
The E-251X10 is 0.010 in oversize and is listed for a 4.0000 in bore diameter. Measure your cylinder bores and confirm they match this size before ordering.
How many cylinders does this engine piston ring set cover?
The set covers eight cylinders. The listed applications use one set per engine.
What are the rings made of?
The top ring is grey iron with phosphate. The second ring is grey iron with phosphate coating and has a reverse torsional face. The oil ring is a 3-piece flex vent design.
Is this a file-fit ring set?
No, this is not a file-fit set. Follow your engine's service information for ring end-gap checks and installation.
Which vehicles does the E-251X10 fit?
It fits many vehicles, including the 1975-1995 Ford F-150 (V8-5.0L) and the 1986-1995 Ford Mustang (V8-5.0L). See the "Vehicles it fits" section for the full list.
