King Engine Bearings MB5184SI 030 Main Bearing Set GM 262 302 327 350 +0.030 Silicon Aluminum

The King Engine Bearings MB5184SI 030 is a bi-metal silicon aluminum main bearing set designed for General Motors small-block engines, including the 262, 302, 327, and 350 cubic inch applications. This set features a 0.030" oversized (030 O/S) flanged design to accommodate reground or worn crankshaft journals.

Material Construction:

King's Silicon Aluminum (SI) bi-metal material uses an aluminum-based alloy strengthened with 2.5–3% silicon content, making it well-suited for medium-load engines and engines equipped with nodular cast iron crankshafts. This material provides excellent conformability, corrosion resistance, and a strong fatigue rating for reliable everyday performance.

Key Features:

• Application: General Motors 262, 302, 327, and 350 cubic inch engines
• Oversize: 0.030" (030) oversized for use with reground crankshafts
• Material: Bi-metal Silicon Aluminum — aluminum base with 2.5–3% silicon
• Best suited for: Medium-load engines and nodular cast iron crankshafts
• Flanged design for proper thrust control and crankshaft alignment
• Manufactured by King Engine Bearings, a globally recognized precision bearing supplier

King Engine Bearings are engineered to OEM and performance tolerances, offering a reliable replacement or rebuild solution for GM small-block engine platforms. The silicon aluminum bi-metal construction delivers a strong balance of load capacity and surface compatibility for long service life.