BAMC-20-55538 Aftermarket GM Marine Exhaust Elbow 120/160 Engines (1964-69) | Sawley's Select Marine Parts

🔧 Product Description

Aftermarket GM Marine Exhaust Elbow 120/160 Engines (1964-69) - Part Number: BAMC-20-55538

A cast-iron exhaust elbow for early GM marine 120HP and 160HP engines. It replaces MerCruiser 39920/55538 and OMC 0509529 elbow families.

⚙️ Key Features

• Early GM marine exhaust-elbow pattern

• Suitable for GM 153 and GM 250 inline engines

• Water-jacketed wet-exhaust construction

• Direct replacement for 39920 and 55538 service numbers

• Use new mounting gasket and hardware

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 55538A2 → Supersedes 39920A1

• 39920A1 → Supersedes 39920

OEM / Related Numbers:

• BAMC-20-55538

• 39920

• 39920A1

• 55538A2

• OMC 0509529

Aftermarket / Verified Equivalents:

• Barr Marine: BAMC-20-55538

• Sierra: 18-1973

• Mallory: 9-40553

🚤 Compatibility

Commonly used on:

• Early GM marine inline-engine exhaust systems

Typically suits:

• Engine models:

• MerCruiser 120HP / GM 153 CID / 2.5L, approximately 1964-1969

• MerCruiser 160HP / GM 250 CID / 4.1L inline-six, approximately 1967-1969

• OMC applications using 0509529

• Engine Families: GM 153 CID inline-four and GM 250 CID inline-six

• Year Range: approximately 1964-1969

🔌 Function

The elbow turns the manifold exhaust and introduces cooling water before discharge into the wet exhaust hose.

Common signs of failure:

• External corrosion, cracking or pin-hole leakage

• Internal carbon, rust or salt restriction

• Cooling water entering the manifold, turbocharger or cylinders

• Steam, reduced cooling-water discharge or an abnormally hot exhaust hose

• Loss of power caused by excessive exhaust back-pressure

📦 Condition

• Brand new aftermarket replacement part

• New and unused

• Supplied in manufacturer or equivalent protective packaging