Water Pump For GM Big Block 7.4 8.2 409 454 502 850454, 18-3577, 18-3574 9-42604

Water Pump for GM Big Block

This water pump is a direct replacement for GM big block engines, cross-referenced with OEM numbers 850454, 18-3577, 18-3574, and 9-42604, designed to circulate coolant and maintain optimal engine temperature.

Overview

This water pump provides reliable coolant circulation for GM big block engines including 7.4L, 8.2L, 409, 454, and 502. It is a high-quality aftermarket water pump built to match OEM specifications and ensure proper cooling system function. Ideal for replacement or restoration of vehicles equipped with a GM big block water pump.

Built For Performance

• Precision-machined cast iron housing for durability
• High-flow impeller design for efficient coolant movement
• Long-life sealed bearing for smooth operation
• Corrosion-resistant finish to withstand coolant exposure
• Includes necessary gasket for installation

Fits These Machines

• for GM 7.4L big block
• for GM 8.2L big block
• for GM 409
• for GM 454
• for GM 502

On-The-Job Use

• Replacement for worn or leaking water pumps in GM big block vehicles
• Cooling system rebuilds in classic trucks and muscle cars
• High-performance engine builds requiring dependable coolant flow
• Restoration projects for Chevrolet and GMC models

Specs At A Glance

Good To Know

Q: Does this water pump require a new gasket? A: A new gasket is typically included, but it is recommended to use a fresh gasket and sealant for proper installation.

Q: Is this water pump for a reverse rotation system? A: This water pump is designed for standard rotation as used in most GM big block applications; verify your belt drive system.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.