King Engine Bearings CR8003SI0.5 SI-Series Connecting Rod Bearing Set GMC 281 +0.50mm

The King Engine Bearings CR8003SI0.5 is a complete connecting rod bearing set engineered for the GMC 281 cubic inch engine. Built to King's renowned SI-Series standard, these bearings feature a bimetal aluminum-silicon construction — blending aluminum with 2.5–3% silicon — delivering excellent strength and durability for medium-load engine applications, particularly those equipped with nodular cast iron crankshafts. This set is sized at +0.50mm oversize, making it the correct choice for engines with reground or undersized crankshaft rod journals.

Key Features:

• SI-Series Bimetal Construction: Aluminum-silicon alloy over a steel backing — a lead-free OE-replacement formulation optimized for strength and embedability
• +0.50mm Oversize: Designed for engines with crankshaft rod journals machined 0.50mm undersize from standard dimensions
• Improved Surface Finish: Enhanced bearing surface finish reduces microscopic ferrite peaks common on improperly ground or polished nodular cast iron crankshafts
• Optimized Oil Clearance: Improved oil clearance design reduces wear, extends engine life, and minimizes operating noise, vibration, and excess oil flow
• Direct OE Replacement: Suitable for OE applications as well as aftermarket gasoline engine rebuilding with stock crankshafts
• Bull's Eye Wall Tolerance: King maintains bearing wall thickness tolerances of ±0.0001″ — tighter than industry standard — for consistent, precise fitment

King Engine Bearings has been a specialist bearing manufacturer since 1960, producing precision engine bearings for automotive, light and heavy-duty truck, marine, aviation, and standby power applications. The CR8003SI0.5 is an ideal solution for engine rebuilders seeking a reliable, high-quality rod bearing with exacting tolerances for the GMC 281 engine platform.