Quick verdict
Choosing between these two marine engines is really a choice between two different propulsion plans: a V8 inboard repower or a small outboard for a fishing boat. The MerCruiser Marine 5.7 L 350 V8 REMAN Inboard Engine is a V8 inboard with a listed price of USD 4,999.00. The HANGKAI 6-12/HP 2/4 Stroke Outboard Motor is a compact outboard with a listed price of USD 239.16. If you are repowering an inboard boat and need V8 muscle, the MerCruiser is the obvious direction. If your boat is a light fishing hull and you want something easy to carry, the HANGKAI makes more sense. The real decision starts with the boat you own.
At a glance
| Feature | MerCruiser 5.7 L 350 V8 REMAN Inboard | HANGKAI 6-12/HP 2/4 Stroke Outboard |
| Listed price | USD 4,999.00 | USD 239.16 |
| Engine position | Inboard | Outboard |
| Condition | Used | New |
| Intended use | V8 inboard repower | Small fishing boat up to 100kg |
| Strengths | Drop-in-ready V8 with bell housing | Lightweight outboard |
| Limitations | Transmission removed and not included | Cylinder scoring risk if run out of water; speed varies with load |
Where each product wins
- Choose the MerCruiser if you need a V8 inboard for repowering an inboard hull.
- Choose the HANGKAI if you need a small outboard for a fishing boat.
- The MerCruiser wins on power and inboard installation; the HANGKAI wins on portability and compact size.
- Neither is a substitute for the other: they power completely different hulls.
A closer look at your options
MerCruiser Marine 5.7 L 350 V8 REMAN Inboard Engine FRESH WATER Drop In Ready CW
This is a used REMAN V8 inboard in a fresh-water configuration. It is presented as running great and drop-in-ready, with the bell housing still attached. That gives you a substantial starting point for an inboard repower project. The main limitation is the transmission: it has been removed and is not included in the sale. So your project needs a plan for the transmission, and the bell housing is the part that stays with the engine. This engine is for someone who wants a 5.7L 350 V8 to build around, not a complete drop-in package with every component included.
HANGKAI 6-12/HP 2/4 Stroke Outboard Motor Fishing Boat Engine Water/ Air Cooling
This is a new outboard with a 6-12/HP range and a 2/4 Stroke label, aimed at fishing boats rather than large cruisers. It is lightweight and easy to carry, with guidance that warns against starting it on the bank or running it out of water because those actions can cause cylinder scoring. It also points out that noise is comparable to a motorcycle and that speed will change as passenger load changes. If you need a portable outboard for a light fishing boat and can live with modest speed, this HANGKAI is a practical match.
Final choice by use case
- Repowering a fresh-water inboard boat: go with the MerCruiser 5.7 L 350 V8 REMAN Inboard Engine.
- Running a small fishing boat of 100kg or less with up to four people: go with the HANGKAI 6-12/HP 2/4 Stroke Outboard.
- If V8 torque and inboard layout are non-negotiable, the MerCruiser is the clear pick.
- If low cost and easy carrying matter most, the HANGKAI is the better fit.
