Crate HEMI® Engine Kit Instruction Sheet www.mopar.com
Rev Level 5.0 – K6862625 3
Drivetrain Requirements
Axle Drive Ratio
The recommended axle drive ratio should be 2.61:1 to 3.90:1 to obtain optimal vehicle performance and
fuel economy. A Limited Slip Differential (LSD) or Open differential is recommended for best drivability.
Tire Size
The recommended rear tire size is 28 to 29.5 inches in overall diameter.
Fuel
The fuel grade required for both 5.7L and 6.4L engines is premium (91 octane or greater). The fuel
pressure is a constant 58.5 PSI with the engine running. Fuel pump flow requirements: Minimum 222
Lbs/Hr @ 58.5 PSI (+/- 5 PSI).
Additional Parts
Some additional parts may be needed that are not supplied in this kit to complete the powertrain. Each
application is unique and all possibilities and configurations may not be covered in this instruction sheet.
These parts can to be ordered separately through your local Chrysler Dealer or an aftermarket supplier.
Front End Accessory Drive (FEAD) Kit
There is multiple options available for the crate engine FEAD kits. Both crate engines kits come
assembled with a car front engine covers. A FEAD kit is necessary to operate engine, the basic FEAD kit
is part number 77072445.
Engine Mounts
Engine mounts to be fabricated or purchased from an aftermarket source to fit the specific application.
The engine side aluminum mounting brackets that are included on the engine are from a 2016 Dodge
Challenger. It is recommended that the engine mounts incorporate production style engine dampers to
allow for engine vibrations. Engine is installed at a 2° angle (rear down) on a 2016 Dodge Challenger.
Oil Pan
The oil pan supplied with the crate engine is a front sump oil pan design from a 2016 Dodge Challenger.
Some applications may require a rear sump oil pan. The kit part number for a rear sump oil pan is
77072450AB.
Transmission
The flywheel and clutch or flex plate and torque converter combinations needed may be unique to the
application. A flywheel and clutch assembly from a 2016 Dodge Challenger will be included with all crate
engines, please utilize the correct combination of parts for the desired drivetrain selected.
Starter
Ensure the correct starter is selected for your transmission and flex plate or flywheel combination. A
starter nose spacer may be required for the starter motor to properly engage and spin the engine.
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