Enginetech BC307JSTD Main Bearings Ford 5.8L 351 Modified Windsor 6.6L 400

The Enginetech BC307JSTD is a crankshaft main bearing set (engine main bearings) in standard size, made for engine rebuilds. Main bearings support the crankshaft and keep it turning smoothly in the block. They hold oil clearances and carry engine loads.

Key Features:

• Standard (STD) size: for crankshaft journals that are at standard dimensions
• High-quality alloys: Enginetech makes its main bearings from alloys chosen for each application. They combine load capacity with wear resistance, anti-seizure properties and embeddability.
• Consistent thickness: the bearings are made on modern equipment to hold even thickness, which helps maintain correct oil clearances
• Controlled parting line chamfers: chamfers are cut at a precise angle so oil can bleed through properly without lowering oil pressure
• Thrust washers: Enginetech includes them where appropriate when they are not already molded into the main bearing

Enginetech has supplied main and rod bearings to engine rebuilders for over 25 years. This bearing is a direct-replacement part that adds protection and durability to a rebuild.