Mercury Marine Catalog - Cylinder Heads

2.5L / 3.0L Cylinder Head

• All new Quicksilver cast iron cylinder head with hardened valve seats
• Heavy duty valve springs
• Screw in rocker studs
• Marine grade brass core plugs
• Features Black-X Composite valves for 42% Longer Life

For: 1963-1989 MCM & GM 2.5L, 1968-1989 MCM & GM 3.0L, 2.5L GM

3.0L Cylinder Head

• All new Quicksilver cast iron cylinder head with hardened valve seats
• Heavy duty valve springs
• Screw in rocker studs
• Marine grade brass core plugs
• Features Black-X Composite valves for 42% Longer Life

For: 1990-2016 MCM 3.0L, 3.0LX & 3.0L MPI

357 Cylinder Head

• All new Quicksilver cast iron cylinder head with hardened valve seats
• 8-bolt intake manifold pattern
• Upgraded ports for higher airflow
• Heavy duty valve springs - 5500 RPM Rev Limit with 0.520" lift
• Screw in rocker studs
• Marine grade brass core plugs
• Features Black-X Composite valves for 42% Longer Life
  • 1.94" Intake
  • 1.50" Exhaust

For: 350 Bravo Quicksilver Crate Engines Carb & MPI, 357 Bravo Plus Series, 350 MPI Tow Sport Plus Series, 357-CT Circle Tank

383 Cylinder Head

• All new Quicksilver cast iron cylinder head with hardened valve seats
• 8-bolt intake manifold pattern
• Upgraded ports for higher airflow
• Beehive valve springs - 6000 RPM Rev Limit with 0.555" lift
• Screw in rocker studs
• Marine grade brass core plugs
• Features Black-X Composite valves for 42% Longer Life
  • 1.94" Intake
  • 1.50" Exhaust

For: 383 4V MCM/MIE Plus Series, 383-CT Circle Tank

Supercedes: 8M0060620

385 Performance Tune Cylinder Head

• All new Quicksilver cast iron cylinder head with hardened valve seats
• 8-bolt intake manifold pattern
• Upgraded ports for higher airflow
• Beehive valve springs - 6000 RPM Rev Limit with 0.555" lift
• Screw in rocker studs
• Marine grade brass core plugs
• Performance Tune Valves - for up to 700 HP - Boosted Applications
  • 1.94" Intake - 24N with Chromium / Cobalt alloy seats
  • 1.50" Exhaust - Nickel Super-Alloy

For: 385 Performance Tuned Plus Series, 5.7 L31 Pressure Charged

• All new Quicksilver cast iron cylinder head with hardened valve seats
• Heavy duty valve springs
• Screw in rocker studs
• Marine grade brass core plugs
• Features Black-X Composite valves for 42% Longer Life

For: 2000-2015 MCM 4.3L & 4.3L MPI, 4.3L 4V Crate Engines, 4.3L 4V Plus Series, 2000-2015 4300 LU3

454 / 502 Cylinder Head

• All new Quicksilver cast iron cylinder head with hardened valve seats
• Rectangular intake ports for 454 & 502 High Output applications
• Big Block Gen V & VI use only - not for Mark IV
• Heavy duty valve springs - 5500 RPM Rev Limit
• 2.19" intake valve
• Screw in rocker studs & push rod guides
• Marine grade brass core plugs
• Features Black-X Composite Valves for 42% Longer Life

For: 1992-2000 MCM 454 / 502 HO & MIE 454 Horizon

5.7L / 6.2L Cylinder Head

• All new Quicksilver cast iron cylinder head with hardened valve seats
• Heavy duty valve springs - 5500 RPM Rev Limit with 0.520" lift
• Screw in rocker studs
• Marine grade brass core plugs
• Features Black-X Composite valves for 42% Longer Life
  • 1.94" Intake
  • 1.50" Exhaust

For: 1996-2016 MCM/MIE 5.7L, 2000-2009 MCM/MIE 6.2L, 350 Quicksilver Crate Engines Carb & MPI, 357 Alpha & 383 MPI Plus Series, 1996-2002 5.7L L31 Gen 1e, 1996-2016 5.7L L31 Gen 1e

540 Cylinder Head - 2.19" Valves

• All new Quicksilver cast iron cylinder head with hardened valve seats
• Rectangular intake ports
• 540 Plus Series or Big Block Gen V & VI Boosted Applications
• Not for Mark IV
• Heavy duty valve springs - 5500 RPM Rev Limit
• 2.19" intake valve
• Screw in rocker studs & push rod guides
• Marine grade brass core plugs
• Features Black-X Composite Valves for 42% Longer Life

For: 540 Mag Bravo 4V Plus Series

Supercedes: 900-8M0094193

540 Cylinder Head - 2.25" Intake Valve

• All new Quicksilver cast iron cylinder head with hardened valve seats
• Rectangular intake ports
• HP 500, 500 EFI, & 540 Bulldog Big Block Gen V & VI Boosted Applications
• Not for Mark IV
• HP 500, 500 EFI, & 540 Bulldog Big Block Gen V & VI Boosted Applications
• 2.19" intake valve
• Screw in rocker studs & push rod guides
• Marine grade brass core plugs
• Features Manley Severe Duty valves

For: HP 500 & 500 EFI, 540 MAG Crate Engines

8.1L Cylinder Head - Driver Side

• All new Quicksilver cast iron cylinder head with hardened valve seats
• Heavy duty valve springs - 5200 RPM Rev Limit
• Screw in rocker studs & push rod guides
• Marine grade brass core plugs
• Features Black-X Composite Valves for 42% Longer Life

For: 2000-2009 MCM 496 & 496 HD, 2000-2009 MIE 8.1S Horizon & 8.1S HO, 496 HO MPI Plus Series, 8.1L Horizon Plus Series, 8.1L L18

8.1L Cylinder Head - Passenger Side

• All new Quicksilver cast iron cylinder head with hardened valve seats
• Heavy duty valve springs - 5200 RPM Rev Limit
• Screw in rocker studs & push rod guides
• Marine grade brass core plugs
• Features Black-X Composite Valves for 42% Longer Life

For: 2000-2009 MCM 496 & 496 HD, 2000-2009 MIE 8.1S Horizon & 8.1S HO, 496 HO MPI Plus Series, 8.1L Horizon Plus Series, 8.1L L18

Mercruiser Complete Cylinder Head  900-880536A18

Mercruiser Complete Cylinder Head 900-8M0061026

Complete Head Assembly 900-880536A10

Mercruiser Cylinder Head (Black) 900-8M0070288

Mercruiser Cylinder Head (Black) 900-8M0070289

Mercruiser Cylinder Head (Port) 900-8M8025141

Mercruiser Cylinder Head (Starboard) 900-8M8025142

Mercruiser Cylinder Head 900-835430T03