Interchanges

Which 5.7? The 09 and later have a number of changes.

But here is a list of generally interchangeable parts.

Crank, 6.1 hemi is Forged 5.7 is Cast both has the same stroke
Rods, Both 6.1 and 5.7 are powdered metal but the 6.1 are beefier. Used 6.1 Cranks are generally available for $250.00.

Pistons NO, you cannot bore the 5.7 to the 6.1 4.050" size.

Heads. You can bolt a set of 6.1 Heads on a 5.7 but it will raise the compression ratio to between 10.8:1 and 11.25:1. So adjustments need to be made. Also the 6.1 Heads flow over 300 CFM out of the box, which is probably more flow than needed. The pre 09 5.7 Heads can be ported to over 325 CFM.

Intake: You can bolt a 6.1 Manifold onto a 5.7 Head, but port matching needs to take place, as there is a pretty good mismatch.

Cams: you can put a 6.1 cam into a 5.7 though you would loose cylinder deactivation.

Regards,

Joe Dokes