What are the differences between the ZR1 engine and the 2009 CTS-V Engine?The fundamental differences are the ZR1 supercharger size is
significantly larger (2.3 L vs. 1.9 L) and the engine uses forged
pistons and titanium connecting rods in addition to other valve train
component differences because of the higher power levels. The ZR1 also
uses a dry-sump oiling system.