505 Performance
Home of the most powerful inline Jeep engine in the world! Second to none! 692 hp...  780 ft pounds of torque.
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Installation Information

Installation Instructions

Before beginning the engine installation – please review the following instructions:

  • Verify the root cause of the original engine failure
  • Check engine assembly for shipping damage.
  • Verify the engine ordered and the engine received is correct for the application
  • Read all additional information supplied with the engine.
  • Have shop manual available for torque, timing, and other factory specifications.

STOP NOW and check your existing components!!

1.  The intake manifold must be thoroughly cleaned and free of all debris before being installed on the engine.    Debris such as old piston, piston ring, or valve material can be trapped in the intake, plenum, and EGR System.  The debris can and will be pulled into the replacement engine causing the engine to fail.  DO NOT GLASS BEAD, SAND BLAST, OR use anything that could get lodged in the intake. 

2.  Installer must diagnose, repair, and insure proper operation of engine related systems and subsystems.  Failure to make repairs to these components may result in engine failure.

Cooling System:

  • Fan (motor, wiring, relays, switches or clutch)
  • Hoses
  • Thermostat
  • Water Pump

Fuel System:

  • Volume and pressure
  • Quality (sugar, water, debris)
  • Injectors
  • Vacuum hoses
  • Controls – PCV & EGR
  • Catalytic converters (plugged, leaking, restricted)
  • Air induction (air cleaner and inlet hoses)

Electrical/Electronic Systems:

  • Stating
  • Charging
  • Ignition
  • Computer controls
  • All associated wiring, relays and sensors



Rotate the crankshaft by hand a minimum of FOUR complete revolutions before engaging the starter.  Nuts, bolts, washers or other small parts may have been dropped into the intake manifold or intake ports and can severely damage replacement engine. 


The oil pump on this engine must be primed and the entire oiling system must be purged of air before the drive belts are installed and the engine is started. 

  • The preferred method is to use a pressurized system to push clean oil through the entire oiling system.
  • A distributor type engine can be primed with priming tool and drill motor to rotate the oil pump shaft.  The technician must make sure that oil flows to the top of the engine and into the rocker arms.
  • Check and adjust oil level after priming and purging is complete
  • Oil coolers need to be replaced with the cooler lines cleaned of all debris.


  • Fill to manufacturer’s recommended levels
  • Proper concentration of manufacturer’s recommended coolant
  • Air bleed:  Many late model cooling systems MUST be air bled or overheating will occur.


Engines equipped with adjustable rocker assemblies must be readjusted after engine  “Run In”.


Oil cooler must be replaced!!!! Cooler can not be cleaned and reused. 

For any technical help during engine installation or after start up please call 505 Performance Tech Support.  All engine reported to be defective will be disassembled and thoroughly inspected. 


Engine oil cooler must be replaced if you have one!!!

The tech department offers the following information concerning reuse of oil coolers.

Some vehicles are originally equipped with oil coolers which are part of the radiator assembly; others may have aftermarket cooler added to the oiling system.

Regardless of design the OIL COOLER must be replaced or the replacement engine warranty will be void. 

Small bearing and crankshaft material cannot be entirely removed by simply flushing the cooler.  If this is attempted and the original cooler is REUSED it will contaminate the engine’s oiling system, resulting in multiple engine failures until cooler is replaced.  

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