12550460 824330T1 Mercruiser Intake Manifold | Genuine Used Part

🔧 Product Description

Genuine GM Marine 4.3L Vortec Four-Barrel Cast-Iron Intake Manifold - MerCruiser Part Number: 824330T1

A genuine cast-iron marine intake manifold for GM 4.3-litre / 262 CID V6 Vortec engines using the eight-bolt cylinder-head pattern and a four-barrel carburettor or throttle-body mounting flange. Number 12550460 is the GM casting number, while 824330T1 is the MerCruiser service reference.

⚙️ Key Features

• Genuine GM marine cast-iron manifold
• MerCruiser service number 824330T1
• GM casting number 12550460
• Eight-bolt Vortec cylinder-head pattern
• Four-barrel marine carburettor flange

🚤 Compatibility

• MerCruiser 4.3L Gen+ / Vortec V6 four-barrel packages
• Volvo Penta 4.3GL, 4.3GS, 4.3Gi and related Vortec packages using 3855806
• Selected OMC, Marine Power and Crusader GM 4.3L marine engines using the same eight-bolt four-barrel layout
• Approximate application era: 1996 onward
• Not suitable for pre-Vortec 12-bolt cylinder heads

🔌 Function

The manifold distributes intake air and fuel evenly to the six cylinders and incorporates marine water passages and mounting points for the carburettor and related cooling components.

⚠️ Common Signs of Failure

• Internal rust or water-passage leakage
• Cracked casting from freezing
• Vacuum leak at the head or carburettor flange
• Warped sealing surfaces
• Coolant or raw water enters an intake runner
• Poor idle, misfire or loss of power

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 824330 → 824330T → 824330T1
• Related 824324T1 and 824324T02 four-barrel Vortec service references
• 12550460 is the GM casting number, not a supersession
• Volvo Penta 3855806 is the cross-brand OEM equivalent

OEM / Related Numbers

• 824330T1
• 824330T
• 824330
• 824324T1
• 824324T02
• GM 12550460
• Volvo Penta 3855806
• Related intake gaskets, thermostat housing, carburettor adapter and fuel fittings

Aftermarket / Verified Equivalents

• Blackstar Marine 4.3L Vortec four-barrel cast-iron intake manifold
• Michigan Motorz aftermarket 4.3L Vortec four-barrel manifold
• Marine Engines 4 Less aftermarket 824330T1 / 3855806 replacement
• Poseidon Marine aftermarket four-barrel Vortec manifold
• Generic direct replacements sold under cross-references 824330T1, 3855806 and 12550460

📦 Condition

• Genuine used part
• Removed from running engine where applicable
• In good working condition unless otherwise stated