It looks like you bought everything you could find your car, nice!


Basically you can use S8 engine block and heads, but need RS6 crankshaft, oil pump, oil pan and intake manifold.
You can also use the RS6 pistons in your S8 engine block, they will hold for 7-1000hp, If you do not have scratches in it so it must be drilled.


Basically you need forged conrods and better valves,
and then new RS6 piston rings, new bearings and gaskets in the S8 engine, then you will be able to have up to 1000hp.


Once you have access to your S8 engine block, so can I show what differentiates in between them = what you have to do to put on the RS6 parts on it.