Enginetech BC409J001 Main Bearing Set GM LS 4.8L 5.3L 5.7L 6.0L 6.2L .001" Oversize

The Enginetech BC409J001 crankshaft main bearing set is precision-engineered for GM Generation III and IV LS engine rebuilds requiring .001 inch oversize bearings. This complete bearing set is designed for 4.8L, 5.3L, 5.7L, 6.0L, and 6.2L LS engines from 1997 to 2017 model years.

Key Features:

• .001 inch oversize outside diameter for machined or line-bored engine blocks
• High-quality aluminum-silicon alloy construction for superior wear resistance
• Captive thrust bearing design for reliable axial load management
• Complete set includes all main bearings needed for installation
• Standard bearing thickness of .095 inches with widths of .805 and 1.028 inches
• Sold as a complete set for full crankshaft support

Enginetech main bearings feature advanced aluminum-silicon material that provides excellent load capacity, anti-friction properties, and embeddability for superior protection during engine operation. These .001 inch oversize bearings are specifically designed for engines where the block housing bore has been machined slightly larger than standard, typically after line boring or honing operations. The oversize outer diameter ensures proper fit and oil clearance when used with standard-size crankshaft journals in modified engine blocks.

Compatible with LS1, LS2, LS3, LS6, LM7, LR4, LQ4, LQ9, LY2, LY5, and other Gen III/IV LS engine variants. Professional installation recommended with proper clearance measurement using plastigauge or micrometers.