Speed Pro 141M Engine Crankshaft Main Bearing Set

Speed Pro 141M Main Bearing Set

Speed Pro 141M is a competition series engine crankshaft main bearing set for Chevrolet big block applications. It uses a steel-backed, overplated bronze alloy construction with a 3/4 grooved design to support oil control in performance builds.

Built for 396, 402, 427, and 454 cubic inch Chevrolet big block engines, this standard-size main set is a direct choice for rebuilds and performance engine work where consistent bearing support matters. The 141M part number is also referenced by MB556HP, MB556XP, and MS829H.

Key Features

• Competition Series main bearing set for Chevrolet big block engines
• 3/4 grooved design for oiling support
• Steel-backed overplated bronze alloy bearing material
• Super Duty Alloy construction
• Standard size main set
• Fits 396, 402, 427, and 454 displacement applications

Application Details

Speed Pro 141M is built for Chevrolet big block engine assemblies used in performance-focused street and track builds. It fits 1970-1976 Chevrolet Caprice, 1970-1976 Chevrolet Impala, 1970-1975 Chevrolet Bel Air, 1973-1975 Chevrolet Malibu, 1970-1975 Chevrolet Monte Carlo, 1970-1974 Chevrolet Corvette, 1970-1971 Chevrolet Nova, 1970-1971 Pontiac Acadian, 1970 Pontiac Laurentian, and 1970 Pontiac Parisienne. For shoppers searching for a Chevrolet big block main bearing set for 454 engine rebuilds or a standard-size crankshaft main bearing set for classic GM performance applications, 141M matches those needs directly.

What It Helps Address

• Crankshaft main bearing wear during engine rebuilds
• Oil distribution needs in 3/4 grooved bearing applications
• Clearance requirements for standard-size main bearing setups
• Performance engine service on Chevrolet big block platforms
• Restoration work on classic Chevrolet and Pontiac V8 vehicles

Installation Notes

Verify crankshaft journal size, bearing clearance, and engine family before assembly. This standard-size main bearing set is intended for Chevrolet big block engines with the listed displacement and vehicle coverage. Confirm the engine code and machining condition during teardown so the bearing selection matches the block and crankshaft specifications.

Quality Assurance

Speed Pro positions this part within its Competition Series line for performance engine components. The brand describes its engine parts as value-focused components for track use, strip use, and street-driven builds.