807400A1 Aftermarket Mercruiser V8 Big Block 7.4L/8.2L Heat Exchanger | Sawley's Select Marine Parts

🔧 Product Description

Aftermarket Mercruiser V8 Big Block 7.4L/8.2L Heat Exchanger - Replacement Part Number: 807400A1

Front-mounted heat exchanger for MerCruiser Gen VI big-block closed-cooling systems.

⚙️ Key Features

• Marine-grade shell-and-tube heat exchanger

• Designed as a direct replacement for the listed reference numbers

• Helps maintain stable operating temperature under sustained marine load

• Marine connection sizes and mounting points must match the original assembly

• Suitable for professional marine cooling-system service and replacement

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 807400A1 → Supersedes 807400

OEM / Related Numbers:

• 807400A1

• 807400

Aftermarket / Verified Equivalents:

• Seakamp: 807400A1-CN

• Lenco: LE-807400

• Mr Cool: MRC807400A1

🚤 Compatibility

Commonly used on:

• Marine-grade shell-and-tube heat exchanger systems

Typically suits:

• Engine models:

• 7.4L MPI and MIE Gen VI Bravo

• 8.2L MPI and MIE Gen VI Bravo

• 454 MAG and 502 MAG Bravo Gen VI

• 7.4L L29 applications

• Engine Displacement: 454 CID / 7.4L and 502 CID / 8.2L

• Overall Length: approximately 20 in

• Mounting Position: front mount

• Year Range: approximately 1996-2000

🔌 Function

The heat exchanger keeps closed-loop coolant separate from seawater while transferring heat through the tube stack.

Common signs of failure:

• Engine or generator temperature rises above normal under load

• Coolant loss or seawater leakage around the exchanger

• Restricted seawater flow from scale, debris or damaged tubes

• Coolant contamination caused by an internal tube failure

• Corroded end covers, tube stack or sacrificial anode

📦 Condition

• Brand new aftermarket replacement part

• New and unused

• Supplied in manufacturer or equivalent protective packaging