Shopping for marine engines propulsion often comes down to one fork: do you need a whole new engine, or just the part that starts it? That's the choice between the MerCruiser 5.7 L 350 V8 REMAN inboard engine and the Arco 70200 marine starter motor. The MerCruiser is a 350 V8 inboard engine sitting at the top of the price range. The Arco is a new marine starter built for Ford 302/351 and compatible with Ford-based MerCruiser, OMC, and Volvo Penta installations, sitting at the bottom of the range. The price spread runs from $169 to $4,999, so the right call depends on whether your boat needs a component or a whole propulsion unit.
Quick Verdict
If your engine block is healthy and the problem is a slow or failed crank, the Arco 70200 is the smart first buy. It's an ignition-protected starter that can return a Ford 302/351 inboard to service for a modest outlay. If you're facing a worn-out 5.7L short block and plan to repower, the MerCruiser 5.7L REMAN is the more complete answer: a reman engine described as drop-in ready, with the bell housing included.
Comparison at a Glance
| MerCruiser 5.7 L 350 V8 REMAN | Arco 70200 Marine Starter Motor | |
|---|---|---|
| Price | USD 4,999.00 | USD 169.00 |
| Condition | Used | New |
| Included | Inboard engine, bell housing; transmission removed | Starter motor, 12V, ignition-protected |
| Best use case | Full inboard engine replacement | Repairing a failed starting system |
Where Each Product Wins
- MerCruiser 5.7 L 350 V8 REMAN wins when you're committed to replacing the entire inboard engine. It gives you a 350 V8 with the bell housing in place, so the long block is ready to install. The used condition means it's a reman unit rather than a brand-new crate engine.
- Arco 70200 Marine Starter Motor wins when you want to avoid an engine swap entirely. It's a new, marine-certified starter for Ford 302 and 351 V8s, and its compatibility list includes MerCruiser, OMC, and Volvo Penta Ford-based engines. It can solve a no-start problem without touching the long block.
Product Notes
MerCruiser Marine 5.7 L 350 V8 REMAN Inboard Engine
This is the high-investment route in this head-to-head. The engine is a fresh-water 5.7 L 350 V8, described as drop-in ready, so it's positioned as the centerpiece of a full repower rather than a parts-level fix. The key limitation is the driveline: the transmission has been removed and is not included, which means you'll need to source a transmission separately or reuse your existing one. As a remanufactured unit, it won't carry the same zero-hour status as a brand-new crate engine, so budget for a careful inspection before installation. If your current short block is beyond saving, this gives you the core component of a replacement marine propulsion package. It's a project purchase that requires planning beyond the engine itself, and it will likely demand more investment in surrounding parts before your boat is back in the water.
Arco 70200 Marine Starter Motor
If your engine already runs but needs a dependable way to crank, the Arco 70200 is the targeted repair. It's an OE-quality marine starter for Ford 302 and 351 V8s with clockwise rotation, and it fits Ford-based MerCruiser, OMC, and Volvo Penta applications. It's also ignition-protected, which matters in a marine engine compartment. The trade-off is fitment responsibility: you must verify your engine model and rotation direction before buying, because the wrong rotation can cause engine damage. The starter also carries a California Prop 65 warning about lead exposure, so handle it carefully. When the long block is sound, this is the low-cost fix that avoids a full repower.
Final Choice by Use Case
- Choose the MerCruiser 5.7 L 350 V8 REMAN if you need a complete fresh-water inboard engine, you're prepared for a full replacement, and you already have or can source a compatible transmission.
- Choose the Arco 70200 Marine Starter Motor if your current Ford 302/351 or Ford-based MerCruiser, OMC, or Volvo Penta engine just won't start and you want a new starter at a much smaller price.
