96705A1 Aftermarket Mercruiser Exhaust Manifold 2.5L & 3.0L Engines | Sawley's Select Marine Parts

🔧 Product Description

Aftermarket Mercruiser Exhaust Manifold 2.5L & 3.0L Engines - Part Number: 96705A1

A water-jacketed cast-iron exhaust manifold for early MerCruiser GM 153 CID / 2.5L and 181 CID / 3.0L inline-four engines. It replaces the 96705A1 / 52390A1 manifold family and is supplied in aftermarket configurations with the required plugs and service hardware.

⚙️ Key Features

• Water-jacketed cast-iron manifold

• For early GM 2.5L and 3.0L inline-four engines

• Matches the early elbow and cooling-passage layout

• Replaces cracked, internally corroded or restricted manifolds

• Use new cylinder-head and elbow gaskets

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 96705A1 → Related replacement for 52390A1

OEM / Related Numbers:

• 96705A1

• 52390A1

• OMC 0503016

• OMC 0509523

Aftermarket / Verified Equivalents:

• Barr Marine: MC-1-96705

• Recmar: REC96705A1

Included Components:

• Exhaust manifold - Part Number: 96705A1 replacement

• Pipe plugs and drain fittings - supplied according to manufacturer package

• Mounting hardware - supplied according to manufacturer package

🚤 Compatibility

Commonly used on:

• Early MerCruiser and OMC GM inline-four exhaust systems

Typically suits:

• Engine models:

• MerCruiser 120HP / GM 153 CID / 2.5L, approximately 1968-1982

• MerCruiser 140HP / GM 181 CID / 3.0L, approximately 1968-1982

• OMC GM 2.5L and 3.0L applications using 0503016 or 0509523

• Engine Displacement: 153 CID / 2.5L and 181 CID / 3.0L

• Material: marine cast iron

• Year Range: approximately 1968-1982

🔌 Function

The manifold collects exhaust gas from the four cylinders while its water jacket removes heat before the gas reaches the exhaust elbow.

Common signs of failure:

• External exhaust or cooling-water leakage

• Internal water leakage into the exhaust ports or cylinders

• Restricted cooling passages or abnormal manifold temperature

• Cracked casting, warped flange or corroded sealing face

• Loss of power caused by an internally restricted exhaust passage

📦 Condition

• Brand new aftermarket replacement part

• New and unused

• Supplied in manufacturer or equivalent protective packaging