for Inboards

A range of perfect engines to replace a classic inboard

357 Horizon Inboard

357 Horizon Inboard 310 HP

  • The ideal repower for your inboard cruiser up to 34'. A quality fuel injected inboard engine to replace any make of 5.7L, 6.0L, 6.2L or 7.4L
  • Standard V-Drive available for All installations
  • 3-Year Factory Backed Limited Warranty

$12495 (Inline) +freight
$12495 (V-Drive) +freight
Call 1-800-562-2742 or click here for more information and to order

  • Inline or V-Drive
HP / kW @ flywheel
  • 310 / 231
Maximum RPM (WOT)
  • 4400 - 4800
Engine type
  • Remanufactured 5.7L GM V-8 Marine Iron Block & Vortec Heads
Displacement (CID/L)
  • 357 / 5.8
Bore and stroke
  • 4.04 x 3.48" / 103 x 88 mm
Compression ratio
  • 9.4:1
Fuel ethanol tolerance
  • Up to 10%
Engine control system
  • Crank Fired High Voltage Switch with Knock Control
Fuel delivery system
  • MPI with Gen II Cool Fuel
Air induction
  • Two-piece long runner intake with 75 mm throttle body (80 mm w/DTS)
Alternator amp / Watt
  • 65 amp / 917 watt
Water drain system
  • Single Point Air-Actuated Water Drain with Flush Port
Exhaust system
  • Iron manifold with Dry-Joint Exhaust Elbow
Cooling system
  • Full Closed Cooled System - Manifolds Included
Accessory drive system
  • Serpentine belt
Lubrication system
  • High Flow Oil Pump
Recommended oil
  • Mercury MerCruiser Synthetic Blend 25W-40, NMMA FC-W rated
  • Powder Metal Rods and Nodular Iron Crankshaft
Rocker arms
  • 1.6:1 Full Roller
Dimensions (L x W x H)
  • 40 x 30 x 22" / 1092 x 740 x 559 mm
Weight (engine only)
  • 980 lbs / 444 kg

$12495 (Inline) +freight
$12495 (V-Drive) +freight
Price is plus shipping
Engines cannot be paid for by Credit Card or by PayPal.
One tough marine engine.

Much tougher. And much better. They have to be after what the boater puts them through. It starts at the Mercury factory. It's the only place they remanufacture engines. Back where they were first designed and built. First thing they do is full dis-assembly. The head is completely taken apart and goes through a four-step, high-pressure "hot" cleaning process. Then they inspect everything. They machine, bore, and hone critical components to original tolerances. They replace cracked or corroded components (no weld repairs like you'll find with the aftermarket guys). We replace the oil pump, the valve springs, and all fasteners. They apply new paint. And finish up with a process nobody in the aftermarket can or will do. Hot testing. They fire up the engine and run it for at least 15 minutes under pressure. See if the oil and coolant are doing their job. See if the engine performs to the same high standards as a new Mercruiser engine. And to make it official, they back it the same way. With the same Mercruiser 3-Year Factory Backed Limited Warranty.

We are proud to offer these factory remanufactured engines.

For more information or to place your order,
call 1-800-562-2742 and ask to speak to a marine engine technician.

Prices and specifications are subject to change without notice