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Mercury-Mercruiser 8M0187373 Quicksilver Longblock 383 4V LH V8 Inboard

8M0187373 Quicksilver Longblock 383 6.3L V8 LH
This is a genuine Mercury Marine 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
Availability: Not in stock - will be transferred from factory
Manufacturer part number: 8M0187373
GTIN: 678633154157
Delivery date: Warehouse transfer - on 4th business day
Manufacturer: Mercury Marine
Shipping specs, pounds and inches
MSRP: $11,531.25
$10,724.07

8M0187373 Quicksilver New Longblock Assembly 350 HP

GM 6.3 Liter Gen+ 383 V8
Left‑Hand / Standard Rotation
Replaces 2011‑2020 383 Mag Inboard (LH /standard rotation) Repower engines

3 Year limited factory warranty. No core or container deposit.

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

8M0187373 Quicksilver New Longblock Assembly 350 HP

GM 6.3 Liter Gen+ 383 V8
Left‑Hand / Standard Rotation
Replaces 2011‑2020 383 Mag Inboard (LH /standard rotation) Repower engines

3 Year limited factory warranty. No core or container deposit.

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

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