The Clevite Engine Crankshaft Main Bearing Set - Standard Size (part number MS-981A) is a direct-fit replacement for 1969-1997 Ford, Mercury, and Lincoln vehicles with 6.6L and 5.8L engines.
Specifications:
| Bearing Note | Contains Full Grooved Main Bearings |
| Bearing O.D. or Housing Bore (max.) | MB2557A=3.1930in MB2558A(F)=3.1930in |
| Bearing O.D. or Housing Bore (min.) | MB2557A=3.1922in MB2558A(F)=3.1922in |
| Bearing Series | A |
| Max. Length | MB2557A=0.8400in MB2558A(F)=1.1330in |
| Max. Wall | MB2557A=0.0960in MB2558A(F)=0.0960in |
| Meets or Exceeds Original Equipment Manufacture Specifications | Yes |
| Size | Standard |
| Standard Shaft Diameter (max.) | MB2557A=3.0002in MB2558A(F)=3.0002in |
| Standard Shaft Diameter (min.) | MB2557A=2.9994in MB2558A(F)=2.9994in |
| Vertical Oil Clearance (min.) | MB2557A=0.0005in MB2558A(F)=0.0005in |
| Vertical Oil Clearance (max.) | MB2557A=0.0029in MB2558A(F)=0.0029in |
| Bearing Material | AL-5 |
| Bearing Item Grade | OE Replacement |
Fits: 1969-1997 Ford, Mercury, and Lincoln models including F-250, F-350, LTD, E-350 Econoline, E-350 Econoline Club Wagon, F-150, E-150 Econoline, E-150 Econoline Club Wagon and more - 6.6L and 5.8L engines. Confirm your year, make, model, and engine before ordering.
Fitment Notes: OE Replacement; A Series (Aluminum); Standard; Contains Full Grooved Main Bearings
Interchanges With: Sealed Power 5078MA
