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

8M0187370 Quicksilver 100% New Longblock Assembly 5.7L 
Superseded from part # 8M0182234 (please see related items below for discounted longblock in stock)

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Superseded from part # 8M0182234