Description
A quality main bearing set is foundational to engine longevity and reliability, especially in high-revving or rebuilt engines where precision fit directly impacts oil pressure and overall durability. The Speed Pro 139M20 delivers the exact undersize spec needed for properly reconditioned crankshafts, ensuring consistent clearances and reducing the risk of bearing failure. Whether you’re completing a bottom-end refresh or building a performance engine, proper bearing selection separates amateur work from professional results.
- Speed Pro manufacture
- 0.020 in undersize
- Small Block Chevy fit
- Main bearing set
- Precision molded construction
- OEM-equivalent performance
- Bolt-on installation
- MPN: 139M20
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