My S5 turbo engine blew recently (Apex Seals) I was wondering if I were to get a S4 turbo and just replace the block and reuse all the manifolds and things would it work?

Thanks

 

Basically, yes. There will be a few things you will need to modify, but for the most part you can make it work easily.

However even easier would be to just stick with the same series of block. The S4 block will be down on power a little due to lower compression and an overly rich mixture.

 

would a s5 rotating assembly work in a s4 block?

 

yes.