Mercruiser Big Block 7.4L V8 Marine Engine Product Specifications
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(7.4L V-8 Models)
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Models |
7.4L MPI |
454 Mag MPI |
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Propshaft Horsepower (SAV1 Rating) |
3101 (2752) |
3851 |
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Propshaft Kilowatts (SAV1 Rating) |
2311Â |
2871 |
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Displacement |
454 cid (7.4 l) |
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Maximum rpm @ WOT3 |
4200-4600 rpm |
4600-5000 rpm |
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Idle rpm in NEUTRAL3 |
600 rpm6 |
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Oil Pressure @ 2000 rpm |
30-70 psi (207-483 kPa) |
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Min. Oil Pressure @ Idle |
4 psi (28 kPa) |
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Thermostat |
160° F (71° C) |
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Timing @ Idle rpm4 |
8° BTDC |
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Firing Order |
1-8-4-3-6-5-7-2 |
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Electrical System |
12-Volt Negative (-) Ground |
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Alternator Rating – Cold Operating Amps |
65 Amps |
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Alternator Rating – Hot Operating Amps |
72 Amps |
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Recommended Battery Rating |
Minimum 650 cca/825mca/150 Ah |
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1 Power Rated in Accordance with NMMA (National Marine Manufacturers’ Association) rating procedures.
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2 Power Rated in Accordance with SAV1 rating procedures. Horsepower differences shown result from differences in test rpm, allowable test tolerances, and/or installation of special kit components.
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3 Measure using an accurate service tachometer with engine at normal operating temperature.
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4 A special procedure must be followed to check or adjust timing. Consult your Authorized Mercury MerCruiser Dealer before attempting this procedure.
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6 Idle speed on EFI models is not adjustable.
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