New Exhaust Elbow Riser Reservoir Compatible With 1976-1989 Mercruiser 3.7L 224 Cid 470 485 488 Mie

MERCRUISER 3.7L 224 CID INLINE 4-CYLINDER APPLICATIONS (1976-1989):

HORSEPOWER VARIANTS (5 RATINGS):
• MerCruiser 3.7L 165HP Inline 4-Cyl (1976-1989)
• MerCruiser 3.7L 170HP Inline 4-Cyl (1976-1989)
• MerCruiser 3.7L 180HP Inline 4-Cyl / 3.7LX (1976-1989)
• MerCruiser 3.7L 185HP Inline 4-Cyl (1976-1989)
• MerCruiser 3.7L 190HP Inline 4-Cyl (1976-1989)

ENGINE CODE DESIGNATIONS:
• MerCruiser 470 (2BBL Merc 224 CID 3.7L I4)
• MerCruiser 470 MIE (Marine Inboard Engine)
• MerCruiser 475 (224 CID 3.7L I4)
• MerCruiser 485 (2BBL Merc 224 CID 3.7L I4)
• MerCruiser 488 (4BBL Merc 224 CID 3.7L I4)

ENGINE SPECIFICATIONS:
• Displacement: 224 CID (3.7 Liters)
• Configuration: Inline 4-Cylinder
• Bore: 4.36 inches
• Stroke: 3.75 inches
• Block: Aluminum (with cast iron cylinder sleeves)
• Head: Iron Ford 460-derived (single head from 460 V8)
• RPM Range: 4,000-4,600 RPM
• Bellhousing: GM SBC bolt pattern (interchangeable)
• MIE Serial: 5520115 THRU 6218036
• Rotation: Left-Hand (standard) and Right-Hand variants

PRODUCT DESCRIPTION:
• Type: Exhaust Elbow with Reservoir (Riser)
• Material: Cast Iron (body)
• Feature: Integrated Reservoir with Cap
• Mounting: Long ~4" bolts (through-body design)
• Position: Between exhaust manifold and exhaust system
• Use Case: Direct replacement for broken/corroded OEM elbow

ALUMINUM MANIFOLD COMPATIBILITY (CRITICAL):
• OEM Aluminum Manifold 93174A4 (early production)
• OEM Aluminum Manifold 816219A1 (mid production)
• OEM Aluminum Manifold 816219A5 (later production)
• Fits ALL three aluminum manifold variants
• Does NOT fit Cast Iron manifold engines

HOW TO IDENTIFY YOUR MANIFOLD TYPE:
• Aluminum Manifold: Long ~4" mounting bolts through elbow body
• Cast Iron Manifold: Shorter mounting bolts (different design)
• Visual: Aluminum manifolds are lighter gray/silver appearance
• Visual: Cast Iron manifolds are darker gray/black appearance
• Mismatching = exhaust leak = engine damage

COMPANION PARTS (sold separately):
• Elbow Mounting Gasket: OEM 27-18272
• Riser Gasket: OEM 27-97863
• Manifold body (if replacing manifold): 93174A4 / 816219A1 / 816219A5

HISTORICAL CONTEXT:
• MerCruiser 3.7L production: 1976-1989 (13 years)
• Unique Mercury-built engine (NOT sourced from GM or Ford automotive)
• Used cylinder head from Ford 460 V8 (hence "470" engine code)
• Aluminum block was unusual choice - caused some overheating issues
• Production ended 1989 - aftermarket parts increasingly critical
• Still found in many legacy MerCruiser sterndrive and inboard boats

OEM PART NUMBERS:
• Mercury/Quicksilver: 98562A6 / 98562A-6
• MPN: 18-1937

CRITICAL FITMENT WARNINGS:
• ALUMINUM MANIFOLD ONLY - verify before ordering
• Does NOT fit Cast Iron manifold engines (different elbow)
• Does NOT fit any other MerCruiser engine (3.0L, V6, V8)
• Does NOT fit Mercury outboard motors (this is sterndrive/inboard)
• Does NOT fit Volvo Penta, OMC Cobra, other sterndrive brands
• Professional installation recommended for exhaust work