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Mercury-Mercruiser 8M0187370 Quicksilver Longblock 5.7L 87-95

8M0187370 Longblock Assembly 5.7L 87-95
This is a genuine Mercury Marine Quicksilver factory OEM part, not aftermarket
Please check our current stock level and order below. Use the Contact Us form at the bottom of the page for any questions
Stock status: Not in stock - will be transferred from factory
Manufacturer part number: 8M0187370
GTIN: 678633154218
Pickup or normally ships: Warehouse transfer - on 2nd-7th business day
Manufacturer: Mercury Marine
$7,881.25
$6,680.00
Product Shipping specifications = pounds and inches

8M0187370 Quicksilver 100% New Longblock Assembly 5.7L 

GM 5.7 Liter Non‑Gen + 350 V8
Left‑Hand / Standard Rotation, for 12 bolt intake manifold
Replaces 1987‑1995 Sterndrive or Inboard 5.7L flat‑tappet marine engines

3 Year limited factory warranty in the U.S.A.

Parts that will need to be transferred or purchased separately
• Balancer
• Flywheel
• Spark Plugs
• Distributor
• Water pump
• Manifold gasket set
• Quicksilver Synthetic Blend 25W‑40 4‑Stroke Oil

Black‑X Valve Technology
• 21N Intake valve parent material
• 24N Exhaust valve parent material
• Plasma nitride prevents valve sticking & increases toughness
• Chrome‑Cobalt alloy seats resist corrosion from alcohol fuels
• Valve life improved 42%
Hardened valve seat installed in the cylinder heads
• Hardened Intake & Exhaust seat inserts
• Premium alloy seat material
Heavy duty head and block castings
• Resist corrosion and cracking
• Higher loading capacity
• Ability to use solid engine mounts
Premium components
• 100% brass core plugs
• High volume oil pump
• Marine valve springs resist fatigue
• Super polished crankshafts using superior material and design features
100% Advanced SIM Testing
• Water and oil passages pressure tested 100%
• Phased rotational testing with hot oil validates all oil passages, bearings, and assembly
• Advanced compression testing verifies cylinder sealing and valve lash integrity
• Oil flush at completion of test removes break‑in debris
• Shipped without oil to prevent spillage while in transit
No core & no container deposits

Superseded from part # 8M0182234

8M0187370 Quicksilver 100% New Longblock Assembly 5.7L 

GM 5.7 Liter Non‑Gen + 350 V8
Left‑Hand / Standard Rotation, for 12 bolt intake manifold
Replaces 1987‑1995 Sterndrive or Inboard 5.7L flat‑tappet marine engines

3 Year limited factory warranty in the U.S.A.

Parts that will need to be transferred or purchased separately
• Balancer
• Flywheel
• Spark Plugs
• Distributor
• Water pump
• Manifold gasket set
• Quicksilver Synthetic Blend 25W‑40 4‑Stroke Oil

Black‑X Valve Technology
• 21N Intake valve parent material
• 24N Exhaust valve parent material
• Plasma nitride prevents valve sticking & increases toughness
• Chrome‑Cobalt alloy seats resist corrosion from alcohol fuels
• Valve life improved 42%
Hardened valve seat installed in the cylinder heads
• Hardened Intake & Exhaust seat inserts
• Premium alloy seat material
Heavy duty head and block castings
• Resist corrosion and cracking
• Higher loading capacity
• Ability to use solid engine mounts
Premium components
• 100% brass core plugs
• High volume oil pump
• Marine valve springs resist fatigue
• Super polished crankshafts using superior material and design features
100% Advanced SIM Testing
• Water and oil passages pressure tested 100%
• Phased rotational testing with hot oil validates all oil passages, bearings, and assembly
• Advanced compression testing verifies cylinder sealing and valve lash integrity
• Oil flush at completion of test removes break‑in debris
• Shipped without oil to prevent spillage while in transit
No core & no container deposits

Superseded from part # 8M0182234

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