A genuine MerCruiser aluminium intake-manifold and carburettor combination for early 3.7-litre / 224 CID inline-four sterndrive engines. The manifold is associated with casting or service family 76328, 76328A2 and 89953A2. Carburettor 1376-5990A1 is a Rochester 2GC two-barrel unit carrying Rochester identification 17057132.
⚙️ Key Features
Genuine MerCruiser 3.7L intake assembly
Manifold casting reference 76328
Related manifold assemblies 76328A2 and 89953A2
Rochester 2GC two-barrel carburettor 1376-5990A1
Original marine-calibrated fuel and throttle configuration
🚤 Compatibility
MerCruiser 470 3.7L / 224 CID - approximately 1976-1984
MerCruiser 485 3.7L / 224 CID - approximately 1980-1982
Selected MerCruiser 165 and 170 3.7L two-barrel packages using manifold 76328 / 89953A2
Carburettor applications include serial ranges documented for 1376-5990A1
The two-barrel flange and throttle linkage must match
🔌 Function
The manifold distributes the air-fuel mixture to the four cylinders, while the marine Rochester carburettor meters fuel and air through idle, transition and main metering circuits.
⚠️ Common Signs of Failure
Vacuum leak or unstable idle
Corroded manifold water passages
Warped carburettor mounting flange
Fuel leakage or flooding
Blocked carburettor passages
Hesitation, poor acceleration or uneven cylinder mixture
🔄 Supersession & Cross Reference
OEM Supersession Chain
76328 is the manifold casting / service reference
76328A2 and 89953A2 are related complete manifold assembly numbers
