Section 4 - Specifications
90-8M0050539 eng MAY 2011 Page 69
377 MAG, SeaCore 377 MAG
NOTE: Performance specifications are obtained and corrected in accordance with SAE J1228/ISO 8665 Crankshaft Power.
All measurements are taken with the engine at normal operating temperature.
RPM range is measured using an accurate service tachometer with the engine at normal operating temperatures.
Oil pressure must be checked with the engine at normal operating temperature.
NOTE: Oil pressure specifications are for reference and may vary.
IMPORTANT: Do not mix spark plug types in an engine. All spark plugs should have the same part number.
Propshaft power
293 kW (320 hp)
Displacement
6.2 L (377 cid)
Alternator amperage
Hot 72 A
Cold 65 A
RPM
WOT 4800–5200
Rev limiter 5350
Idle in neutral 550
Minimum oil pressure
At 2000 RPM 124 kPa (18 psi)
At idle 41 kPa (6 psi)
Thermostat
Seawater‑cooled models 71° C (160° F)
MPI models with closed cooling 77° C (170° F)
Timing at idle
Not Adjustable
Firing order
1‑8‑4‑3‑6‑5‑7‑2
Minimum battery rating
Non‑DTS models 750 CCA, 950 MCA, 180 Ah
DTS models 800 CCA, 1000 MCA, 190 Ah
Spark plug type
AC Platinum (AC 41‑993)
AC Platinum (AC 41‑101)
Spark plug gap
1.5 mm (0.060 in.)
Emission control system
Electronic engine control (EC)
Fluid Specifications
IMPORTANT: All capacities are approximate fluid measures.
Engine—350/377 MAG ECT and SeaCore 350/377 MAG ECT
IMPORTANT: Always use the dipstick to determine the exact quantity of oil or fluid required.
All Models Capacity Fluid Type
Engine oil (with filter) 4.25 L (4.50 US qt) Mercury Full‑Synthetic MerCruiser Engine Oil 20W‑40
Seawater cooling system (winterization
use only)
20 L (21 US qt) Propylene glycol and purified water
Closed cooling system 18 L (19 US qt)
Mercury Extended Life Coolant Antifreeze or extended life
ethylene glycol 5/100 antifreeze mixed 50/50 with purified water
Engine—350/377 MAG and SeaCore 350/377 MAG
IMPORTANT: Always use the dipstick to determine the exact quantity of oil or fluid required.
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