Sealed Power 4125MA

Sealed Power 4125MA is a crankshaft main bearing set for Ford Small Block / Windsor engines. The MA Series uses bi-metal aluminum alloy material and is intended for service rebuilds of classic and later Ford 260, 289, 302 and 5.0 engines.

Application / fitment

The set is used in selected Ford Small Block engines from approximately 1962–2001, including 260, 289, 302 and 5.0. Typical applications include Ford, Lincoln and Mercury vehicles with the Windsor family, but final compatibility depends on main journal diameter, block, crankshaft and bearing size.

• Ford 260 CID V8
• Ford 289 CID V8
• Ford 302 / 5.0 CID V8
• selected Ford Mustang, Falcon, Fairlane, Torino, Bronco, F-Series, Explorer and related models
• selected Mercury Comet, Cougar, Montego, Grand Marquis and related models
• selected Lincoln 5.0 applications depending on year and crankshaft

Before installation, check main journal diameter, housing bore, STD/undersize size and oil clearance. For this family, reference dimensions include shaft diameter approx. 2.2482–2.2490” / 57.104–57.125 mm and tunnel diameter approx. 2.4412–2.4420” / 62.006–62.027 mm, but actual engine measurements should always be used.

Technical information

• Part type: crankshaft main bearings
• Series: MA Series
• Material: bi-metal aluminum alloy
• Engine family: Ford Small Block / Windsor
• Engines: 260 / 289 / 302 / 5.0
• Reference shaft diameter: 2.2482–2.2490” / 57.104–57.125 mm
• Reference housing bore: 2.4412–2.4420” / 62.006–62.027 mm
• Verification: main journal, housing bore, STD/undersize, bearing clearance