807371T1 Aftermarket Mercruiser V8 Big Block Offset Oil Cooler | Sawley's Select Marine Parts

🔧 Product Description

Aftermarket Mercruiser V8 Big Block Offset Oil Cooler - Replacement Part Number: 807371T1

Offset-port engine-oil cooler for MerCruiser 7.4L and 8.2L big-block engines.

⚙️ Key Features

• Marine-grade shell-and-tube oil cooler

• 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:

• 807371T1 (offset-port version)

OEM / Related Numbers:

• 807371T1

• 807371T inline-port sister cooler

Aftermarket / Verified Equivalents:

• Mr Cool: MRC807371T1

• Seakamp: 807371T1 replacement

• Lenco: 807371T1 replacement

🚤 Compatibility

Commonly used on:

• Marine-grade shell-and-tube oil cooler systems

Typically suits:

• Engine models:

• 357 Alpha 4V and MAG Bravo 4V

• 383 performance packages

• 454 MAG

• 502 MAG

• 7.4L and 8.2L big-block engines

• Overall Length: 10 in

• Bundle Length: 7 in

• Body Diameter: approximately 2-1/8 in

• Water Connections: 1-1/4 in

• Oil Connections: 1/2 in offset layout

🔌 Function

The cooler transfers heat from oil into the raw-water circuit without allowing the fluids to mix.

Common signs of failure:

• Oil or steering-fluid temperature rises above normal

• Loss of pressure or reduced transmission/steering performance as oil heats

• Oil sheen at the exhaust outlet or cross-contamination

• External leakage from fittings, seams or tube ends

• Restricted seawater flow, corrosion or internal tube failure

📦 Condition

• Brand new aftermarket replacement part

• New and unused

• Supplied in manufacturer or equivalent protective packaging