King Engine Bearings CR 691SI0.25 Connecting Rod Bearing Set +0.25mm Oversize

The King Engine Bearings CR 691SI0.25 is an OE-replacement connecting rod bearing set designed for the Ford V-6 183 cubic inch engine. This set is offered in a +0.25mm oversize to accommodate reground crankshafts and restore proper bearing clearances during engine rebuilds.

These bearings are constructed using King's bi-metal SI material — an aluminum-based alloy strengthened with 2.5–3% silicon — bonded to a steel backing. This formulation delivers excellent strength and wear resistance, making it well-suited for medium-load applications, particularly in engines equipped with nodular cast iron crankshafts. The SI material is also a lead-free design, offering an environmentally responsible alternative to traditional tri-metal bearing construction.

Key Features:

• Bi-metal aluminum-silicon (SI) construction on steel backing
• Lead-free, environmentally responsible bearing material
• +0.25mm oversize for use with reground crankshafts
• Designed for medium-load engines with nodular cast iron crankshafts
• King Bull's Eye Tolerance™ Technology for precise wall thickness consistency
• OE-replacement quality for reliable engine performance

King Engine Bearings has been a specialist in precision engine bearings since 1960, engineering products for automotive, light and heavy duty truck, marine, and other internal combustion engine applications. The CR 691SI0.25 is the rod bearing complement to the MB 459SI main bearing set for this engine family.