300 HP
SeaPro Commercial
Mercury 300 HP SeaPro
Commercial · V8
$40,640 MSRP
Commercial-grade durability for those who run hard all day — heavy-duty components, extended service intervals and the reliability your livelihood depends on.
Specifications
| Horsepower | 300 HP |
| Configuration | V8 (64°) |
| Displacement | 4.6 L / 279 cid |
| Full-throttle RPM | 5200–6000 |
| Dry weight | ~600 lb |
| Alternator | 85 A |
| Gear ratio | 1.75:1 / 1.85:1 |
| Gearcase | 5.44" HD |
| Fuel | EFI · 87 octane |
| MSRP (base) | $40,640 |
Specifications are Mercury published figures for this engine platform; exact weight, gearcase and rigging vary by shaft length and configuration — confirm on your quote.
Parts & diagrams for this engine
Genuine parts
Parts that fit your 300 HP SeaPro →
Jump to the parts store, pre-filtered to your engine — kits, water pumps, anodes, filters and more, factory-direct.
Exploded diagrams
Look up the 300 HP SeaPro diagram ↗
Find the exact component on Mercury’s official exploded parts diagrams by serial number or model, then order it here.