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Ensure strength and reliability in your engine rebuild with the King MB5304AM0.25 Main Bearing Set, designed for Kia and Mazda DOHC 16-valve, SOHC 16-valve, and SOHC 8-valve engines. Built for precision and performance, this +0.25mm oversize bearing set is the perfect solution for engines that have been line-bored or require oversized main bearings during a rebuild.
Manufactured to exacting standards, King main bearings provide OEM-level fitment while delivering the durability needed for performance driving. The MB5304AM0.25 set features premium bearing materials that ensure superior load distribution, excellent wear resistance, and consistent oil clearance—protecting your crankshaft from damage under extreme conditions.
Ideal for both street enthusiasts and track-day racers, this bearing set offers the perfect balance between strength and conformability. Whether you’re restoring a Mazda daily driver, rebuilding a high-performance B-series engine, or preparing a Miata for racing, King Bearings delivers unmatched reliability.
Key Benefits:
Fits Kia/Mazda DOHC 16V, SOHC 16V, and SOHC 8V engines
+0.25mm oversize for rebuilt/line-bored applications
Premium bearing materials for long-term durability
Excellent load distribution and oil clearance
Trusted King Bearings quality, proven in performance builds
Protect your investment and build with confidence—choose the King MB5304AM0.25 Main Bearing Set for lasting performance on the street or track.
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 |
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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