How to test 5.7 hemi?

Do you have any wiring at all?

Do you have any accessories?

Do you have the intake and exhaust manifolds?

If you have the engine harness (This is the simple harness that connects the sensors, injectors, and coils, to the computer) the cheapest route to getting the motor running is Megasquirt 3. You'll need to build or buy the MS 3 ECM, make/modify a wiring harness, fabricate or buy and adapter to run a cable operated throttle body FAST sells them for their 92mm cable operated throttle body (Originally these cars came with a drive by wire throttle body). Buy a fuel pump and use a combination fuel filter and fuel regulator off of a 99 Corvette. Total cost $1000 - $1500

If you have no harness at all buy the one listed here for a $100.00 and use it as your starting point for MS3.

Regardless of what you injection method you are leaning towards, as others have said, pull the pan and the heads and do a thorough inspection. If you have a broken rod, the motor may still spin freely.

Regards,

Joe Dokes