Mercury Marine Catalog - Cylinder Heads

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

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

Mercruiser Complete Cylinder Head  900-880536A18

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

CYLINDER HEAD Mercruiser 900-841020A08

Supersedes: 900-841020A2
900-841020A04

Supercedes: 900-841020A2, 900-841020A04

CYLINDER HEAD Mercruiser 900-845403A02

CYLINDER HEAD Mercruiser 900-845404A02

CYLINDER HEAD Mercruiser 900-879172206

Supersedes: 900-898101415

CYLINDER HEAD Mercruiser 900-880536A16

Mercruiser Cylinder Head 900-8M0061735

Cylinder Head Assembly 5.7L Mercruiser 938-883490R1

Supersedes: 938-884741R

Fully Assembled Remanufactured Cylinder Head (Brand new head casting)
Fits: MCM/MIE (1987‑1996) 5.7L (non‑Gen +) engines

Supercedes: 938-884741R50, 938-884741R

Cylinder Head Assembly Mercruiser 8M0046344