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Rebuild your engine with confidence using the King MB5304AM0.5 Main Bearing Set, engineered for Mazda and Kia DOHC 16-valve, SOHC 16-valve, and SOHC 8-valve engines. Designed with precision and durability in mind, this +0.5mm oversize bearing set is the perfect solution for engines that have undergone machining, line boring, or require oversized bearings for proper crankshaft clearance.
King main bearings are trusted worldwide for their OEM-level fitment and reliability. Manufactured to exacting standards, the MB5304AM0.5 set ensures superior oil clearance, excellent load distribution, and long-lasting wear resistance. Whether you’re rebuilding a stock daily driver, maintaining a track-prepped Miata, or restoring a Mazda B-series engine, King delivers the durability and consistency your build requires.
Crafted from premium bearing materials, this set provides optimal balance between strength and conformability—helping to protect the crankshaft under heavy loads and extended RPM operation. Backed by King’s reputation for precision engineering and high-performance applications, these main bearings are equally at home in factory rebuilds and high-output builds.
Key Benefits:
Fits Kia/Mazda DOHC 16V, SOHC 16V, SOHC 8V engines
+0.5mm oversize for rebuilt or line-bored engines
OEM-grade reliability and precision fitment
Excellent load distribution and oil clearance
Durable materials for long-term performance
Upgrade your rebuild with the King MB5304AM0.5 Main Bearing Set—a proven choice for both street and race applications.
This Part Fits:
Year | Make | Model | Submodel |
---|---|---|---|
1999 | Mazda | Miata | 10th Anniversary |
1994-1997,1999-2005 | Mazda | Miata | Base |
2000-2005 | Mazda | Miata | LS |
1994-1997 | Mazda | Miata | M Edition |
2004-2005 | Mazda | Miata | Mazdaspeed |
2000-2003 | Mazda | Miata | SE |
2003 | Mazda | Miata | Shinsen |
1997 | Mazda | Miata | STO |
1995 | Mazda | MX-3 | Base |
Garage 56 believes so strongly in the products we sell that every item comes with a full 365-day replacement gurantee - regardless of the manufacturer warranty timeline.
In-stock orders placed before 1pm EST ship same day. All qualifying orders of $56 or more ship free. Flat-rate and expedited shipping options are available at checkout.
Items marked as "Special Order" are available for shipment direct from the manufacturer - also known as "drop shipping". In most instances we are able to ship directly to you however, in limited circumstances we will need to order the item into our warehouse before we are able to dispatch to you. In all cases, your form of payment will not be finalized until we confirm availability of all Special Order items - place your order with confidence!
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