21 | 12 | 2025
 
 


5.7 TKS

- 260 hp

 
   
OverwiewFeaturesSpecifications 

 

At 260 hp, the 5.7 TKS Inboard is the value leader in the MerCruiser Inboard line. Its proven small block V-8 offers smooth operation and our exclusive TKS system, along with a host of other standard MerCruiser inboard features. Included is MerCruiser's exclusive Turn Key Starting (TKS) system, standard on all carbureted engines. This patented feature eliminates the hassle of starting a cold engine. Simply turn the key – no choke, pumping or priming required. The entire MerCruiser gas lineup features Turn Key Starting. No other engine manufacturer can match that.

       
    RELIABILITY
  • Thunderbolt V Hi-Energy Ignition and platinum-tipped spark plugs ensure reliable starts
  • Dry-joint exhaust eliminates the chance for water to enter engine through leaky gaskets
  • Water-separating fuel filter helps protect fuel system and engine against damage
  • Industry-exclusive 3-year limited corrosion failure warranty
  • Proven GM cast iron block V8 power for years of reliable operation
  • EDP-coated exhaust elbows resist temperature and corrosion for long life
  • Serpentine belt system for longer belt life
PERFORMANCE
  • Dual Plane intake manifold for improved fuel atomization means more power & torque
  • Revised fuel calibration for more crisp acceleration and improved running quality
  • Low restriction flame arrestor for added horsepower and torque
EASY OWNERSHIP
  • 3-year/300 hour maintenance interval on many periodic service items saves time and money
  • Easy Oil Drain system is cleaner and makes periodic service simple and less work
  • Color-coded service points makes checking fluid levels simple and straightforward
  • Operates on easy to find, less expensive 87 octane fuel
  • No tools required to drain water from engine with blue drain plugs
TECHNOLOGY
  • Turn Key Starting for easy starts, cold or hot, every time with no choking or priming
  • The helm-mounted Audio Warning System monitors oil pressure and engine temperature and provides an instant alarm if either of these vary from normal range
  • Large 65 Amp alternator provides plenty of power for popular onboard electronics
 
   
 
Power 260HP (191KW)
Full Throttle Range 4200 - 4600 RPM
Displacement 350 CID (5.7L)
Engine Type V8
Bore & Stroke 4.00" X 3.48" (101mm X 88mm)
Compression Ratio 9.4:1
Fuel Requirement 87 Octane (R+M)/2
Fuel System 2V Carb with Turn Key Start & Electric Fuel Pump
Induction System Dual Plane Iron Intake Manifold
Ignition System Thunderbolt V with Knock Control
Charging System 65 Amp/917 Watt Alternator
Water Drain System Multi Point Drain - Hand Removable Blue Drain Plugs
Exhaust System Closed Cooled Iron Manifold with EDP Coated Dry-joint Exhaust Elbow
Cooling System Thermostatically Controlled, Raw Water
Accessory Drive System Serpentine Belt
Recommended Engine Oil MerCruiser Full Synthetic Engine Oil - SAE 20W-40
Engine Guardian System Low Oil Pressure, High Coolant Temperature, High Transmission Temperature
Velvet Drive 5000A 1.25, 1.5, 2.0, 2.5, 2.8:1
Velvet Drive 5000V 1.5, 2.0, 2.5:1
Velvet Drive 71C 1.0:1
Velvet Drive 72C 1.0:1
ZF 63A 1.5, 2.0, 2.5, 2.7:1
ZF 63 IV 1.5, 2.0, 2.5:1
ZF 45 C N/A
Dimensions (LxWxH) in 43x 30 x 22
Dimensions (LxWxH) mm 1092 x 740 x 559
Weight w/ Velvet Drive (lbs./kg) 888/400
Optional Freshwater Cooling Kit