81
CA956
Engine Specifications
(V-8 Models)
Models 7.4L MPI 454 Mag MPI
Propshaft Horsepower
(SAV1 Rating)
310
1
(275
2
)
385
1
Propshaft Kilowatts
(SAV1 Rating)
231
1
(205
2
)
287
1
Displacement 454 cid (7.4 l)
Maximum rpm @ WOT
3
4200-4600 rpm 4600-5000 rpm
Idle rpm in NEUTRAL
3
600 rpm
6
Oil Pressure @ 2000 rpm 30-70 psi (207-483 kPa)
Min. Oil Pressure @ Idle 4 psi (28 kPa)
Thermostat 160° F (71° C)
Timing @ Idle rpm
4
8° BTDC
Firing Order 1-8-4-3-6-5-7-2
Electrical System 12-Volt Negative (–) Ground
Alternator Rating - Hot
Operating Amps
65 Amps
Alternator Rating - Cold
Operating Amps
72 Amps
Recommended Battery
Rating
Minimum 650 cca/825 mca/150 Ah
1
Power Rated in Accordance with NMMA (National Marine Manufacturers’ Associa-
tion) rating procedures.
2
Power Rated in Accordance with SAV1 rating procedures. Horsepower differences
shown result from differences in test rpm, allowable test tolerances, and/or installa-
tion of special kit components.
3
Measured using an accurate service tachometer with engine at normal operating
temperature.
4
A special procedure must be followed to check or adjust timing. Consult your
Authorized Mercury MerCruiser Dealer before attempting this procedure.
6
Idle speed on EFI models is not adjustable.
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