Enginetech BC364J001 Crankshaft Main Bearing Set .001" Undersize Big Block Chevy BBC 366 396 402 427 454

The Enginetech BC364J001 is a .001" undersize crankshaft main bearing set designed for General Motors Big Block Chevrolet (BBC) engines. This set is engineered for engine rebuilds where the crankshaft journals have been lightly machined, providing the precise oil clearance needed for reliable long-term engine performance.

Enginetech's main bearings are manufactured using an advanced aluminum-silicon alloy material, which delivers performance equal to or better than traditional tri-metal designs. Parting line chamfers are precision-cut at the correct angle to allow optimal oil bleed-through without sacrificing oil pressure. Consistent bearing thickness is maintained through state-of-the-art manufacturing equipment, ensuring proper oil clearances throughout the set.

Key Features:

• Undersize: .001" (0.025mm) undersize inner diameter for lightly reground crankshafts
• Material: Advanced aluminum-silicon bi-metal alloy construction
• Precision parting line chamfers for optimal oil flow without pressure loss
• Consistent bearing thickness for correct oil clearances
• Thrust washers included where applicable
• Available in multiple undersizes to suit various crankshaft grind specifications

This main bearing set is a trusted choice among professional engine rebuilders for Big Block Chevy applications, offering a reliable, high-quality replacement for worn or damaged crankshaft main bearings.