Hi Kyle, the bare block is about the only thing the same between the two engines.
-The supercharged engine has stronger pistons with a lower compression ratio
- different rods
- crank balanced different
- different flexplate again balanced different
- crank pulley/balancer balanced different and has an extra section machined on the end for running the supercharger belt
- cylinder heads have holes machined in intake runners for fuel injectors
- larger fuel injectors and completely different fuel rail
- cam sprocket for timing chain retarded 2 deg on NA engine
- intake manifold
- valve covers
- coil pack bracket and all associated sc belt pulleys and brackets
- transmissions has larger torque converter and differential, different gearing
- pcm to match the above differences
Many guys do what is called a top-swap which basically is using from the heads and up off of a supercharged engine. This will give you the topend but you retain your stock NA bottom end and trans and this requires custom pcm tuning to make work. There is a company ZZP that sells or used to sell modified lower intake manifolds and supercharger housings that allow you to retain your stock heads but cost wise you really arent saving anything, it just makes the job easier to do.
Originally Posted by Trannyman95
