Mercury-Mercruiser 8M0187371 Quicksilver Longblock 5.7L V-8 91-97

New Quicksilver 5.7L 1991-97 ReplacementLongblock

GM 5.7 Liter Non-Gen + 350 V8
Left-Hand / Standard Rotation
Replaces 1991-1997 Sterndrive or Inboard 5.7L roller-lifter marine engines

3 Year Limited Factory Warranty! No core or container deposit!

Premium components
100% brass core plugs
High volume oil pump
Marine valve springs resist fatigue
Super polished crankshafts using superior material and design features
Heavy duty head and block castings
Resist corrosion and cracking
Higher loading capacity
Ability to use solid engine mounts
Hardened valve seat installed in the cylinder heads
Hardened Intake & Exhaust seat inserts
Premium alloy seat material
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%
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

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