When it comes to marine engines propulsion, the choice between a small outboard and a big inboard V8 is about more than raw power. It's about where you'll cruise, how much boat you need to push, and what your budget can justify. If you're caught between a 3.5HP outboard and a 5.7L MerCruiser inboard, you're really weighing two very different boating experiences.
Quick Verdict
The 3.5HP outboard is priced at $187.75 and gives you a new, lightweight way to power a small dinghy, kayak, or fishing craft with a simple 2-stroke engine. The MerCruiser 5.7L V8, priced at $4,999.00, is a used remanufactured inboard engine for much larger boats, offering serious displacement in a ready-to-install fresh-water package. Pick the outboard for small watercraft and portability; pick the V8 inboard if you have a sizable inboard hull and need serious thrust.
Comparison
| Feature | 3.5HP Outboard | MerCruiser 5.7L Inboard |
|---|---|---|
| Price | $187.75 | $4,999.00 |
| Engine type | 2-stroke outboard | V8 inboard (REMAN) |
| Condition | New | Used |
| Output | 3.5 hp / 2.5 kW | 5.7 L displacement |
| Notable extras | CDI ignition, water cooling, 3-blade prop | Drop-in ready, bell housing included |
Where Each Product Wins
- The 3.5HP outboard wins for budget-minded boaters who need a simple, portable way to move a small watercraft.
- The MerCruiser wins for owners of larger inboard boats who want serious V8 displacement and a drop-in ready package.
Product Notes
3.5HP 4HP 6HP 7HP Outboard Boat Motor Engine 2 Stroke 4 Stroke Water Cooling
This outboard is all about low-cost, small-water convenience. You get a new 3.5hp two-stroke engine with a 2.5kW maximum output and a full-throttle operating range of 4000-5000r/min. The CDI ignition and water cooling help it handle varied conditions, while the 6.7-inch three-blade propeller is sized for efficient running. Choose it for a small boat, tender, or fishing rig where weight and budget matter. The limitation is the compact scale: 3.5hp is not meant to push a large hull, and the gear ratio of 27/13 and two-stroke power band mean you'll plan around modest cruising speeds.
MerCruiser Marine 5.7 L 350 V8 REMAN Inboard Engine FRESH WATER Drop In Ready CW
The MerCruiser 5.7L V8 is a used, remanufactured inboard engine built for much bigger boats. It comes with fresh-water drop-in readiness, meaning you can install it into a suitable inboard hull without a rebuild. The engine runs great, has CW (clockwise) RH rotation, and still includes the bell housing; the transmission is removed and not included in the sale. The reason to choose it is the massive power potential of a 5.7L V8 in a package that is ready to install. The limitation: it's used, and you'll need to separately source a transmission, plus the price is a substantial investment compared to small outboards.
Final Choice by Use Case
If your boat is a kayak, small aluminum skiff, or lightweight fishing tender, the 3.5HP outboard is the practical pick: new, inexpensive, and portable. If you own a larger inboard boat and need a drop-in 5.7L V8 with the bell housing included, the MerCruiser is the serious power choice. For most boaters with a small craft and a tight budget, the outboard gives you a low-cost way onto the water; for the inboard crowd, the MerCruiser brings V8 displacement and remanufactured readiness.
