BCBC M307 Engine Oil Pump

Engine Oil Pump Overview

This Melling engine oil pump, part number M307, is a standard replacement pump built for dependable oil delivery in a wide range of Chevrolet and GMC applications. It is made in the USA and uses gear and gerotor engineering to support consistent pressure and efficient operation.

Key Features

• Standard replacement engine oil pump for stock applications
• Steel gears with a spur gear design for controlled operation
• Cast iron housing and cover for durable construction
• Precision-ground end plates for improved wear resistance
• Individually tested for pressure and flow under engine-like conditions
• Rust preventative finish for added surface protection

Detailed Description

M307 is engineered for stock oiling systems that require standard pressure and standard volume performance. The pump uses close-tolerance machined gears, a drive shaft design, and a 0.750-inch inlet size to support proper engine pressure and efficient oil movement. This part number M307 is a direct service option for many Chevrolet and GMC trucks, vans, and medium-duty models, including Chevrolet Silverado 2500 HD, GMC Sierra 3500, and Chevrolet C3500HD applications.

Melling’s Stock product line focuses on replacement parts built to production standards, with each pump assembled from quality materials and tested before release. For buyers searching for an engine oil pump for Chevrolet Silverado 2500 HD or GMC Sierra 2500 HD fitment, M307 provides a stock-style solution for the listed applications.

What It Is Used For

• Low oil pressure caused by a worn pump
• Inconsistent oil circulation in a stock engine setup
• Excessive wear from aging pump gears or cover surfaces
• Oil delivery concerns during normal engine operation
• Replacement during engine service or rebuild work

Installation Notes and Tips

Verify engine application and stock configuration before installation. Confirm the pump drive arrangement, inlet size, and mounting points match the original unit. Inspect the oil pickup, gasket surfaces, and related engine components during service, and prime the oiling system according to the vehicle service procedure before startup.

Quality Assurance

Melling manufactures this pump in the USA and tests each unit for pressure and flow under conditions intended to duplicate actual engine operation. The M307 is assembled to high production standards using quality materials for consistent replacement performance.