Looking to replace your existing or worn-out marine engine? Get this replacement engine for a Mercruiser 450hp 502ci marine engine. Designed to exceed expectations, this engine offers unmatched performance and lasting durability.
- Horsepower: 515 @ Crank - Estimated prop power 450HP
- Torque: 570 @ Crank - Estimated prop power 500TQ
- Block: Dart Big M 9.8 4 Bolt Main 1pc Seal
- Bore/Stroke: 4.470 x 4.000
- Displacement: 502 C.I.D.
- Crankshaft: Scat Nodular Iron 4.000" Stroke Externally Balanced
- Connecting Rods: Scat 4340 Forged I Beam 6.385" ARP 8740 Bolts
- Pistons: Forged
- Piston Rings: Moly Rings
- Compression Ratio: 8.9:1 Compression
- Camshaft: Hydraulic Roller
- Camshaft Specifications: 224/224 @050 .483in/.483ex 115LSA
- Camshaft Bearings: Installed & Clocked to OEM Position
- Cylinder Heads: Dart Iron Eagle Rect-Port 119cc/308cc 2.25/1.88
- Freeze Plugs: Brass Installed & Sealed
- Rocker Arms: Stamped Steel 1.7 Ratio
- Oil Galley Plugs: Installed & Sealed
- Oil Pan: OE 5qt.
- Weight: 565
ATK specializes in muscle. With the highest quality internal parts and Dyno Proven combinations of every engine built, ATK is able to add the most bang for your buck and back it up with an industry leading warranty. Check out our three stages of performance Ford Engines: they are separated by level of dress.
ATK High Performance GM 502 515 HP Stage 1 Long Block Crate Engines
• Oil Filter: Wix or K&N Recommended Per Your Application
• Fuel Delivery: OE MPFI System or Quick Fuel Carburetor 780cfm #HR-780-VS
• Intake Manifold: Stock Cast Iron Marine or Aftermarket Performance
• Fuel Injectors: Stock Injectors
• Spark Plugs: Autolite #AR3933
• Spark Plug Gap: .035''
• Harmonic Balancer/Damper: POWERBOND Externally Balanced 8" #PB1018-N
• Flex Plate / Flywheel: Externally Balanced
• Timing: 34-36 Degrees
• Water Pump: Per Application
• Firing Order: 1 8 4 3 6 5 7 2
• Exhuast: Reuse Factory Exhaust system
• Fuel Pump: Marine Electric Or 110GPH Mechanical
• Ignition: Stock Marine Grade
Disclaimer: The parts listed are ATK’s recommendations of parts to be used to obtain our power figures listed. Power figures can vary based on parts used by the end user. It is the customer’s responsibility to verify components will work for their application. Some modifications to the vehicle may be required using these and or other aftermarket parts.
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