This is 100% untrue. Holden designed this engine from scratch. Has nothing to do with the Busso Alfa engine. Heck it would all over GM and Holden advertisements if even remotely trueOn the Holden engine question-- This is the little I know about that question. Please correct me in any areas that are not correct.
I was contacted by a gentleman in northern New York who was interested in buying ALFA engine parts for his 164 24v 3.0 engine into a GTV6 chassis project. He changed his mind after doing more research. He told me he had decided to go with a V6 from a Chevy Camaro. This engine was based on the ALFA 24v 3.0, where GM had purchased the licensing rights from ALFA. GM had swapped out the rubber timing belts for a more robust chain drive, and enlarged the displacement to around 3.6 or 3.7, and was pumping out 350HP. He found a Camaro in a salvage yard for the engine. I heard later that the Camaro engine was also used in Holdens.
He added that if anyone came down on him for using a GM engine in an ALFA, he could reply that the basic engine was design was originally from ALFA.. the chain timing drive would save him all the headaches of the rubber belts... it had about 200HP more than the ALFA 12v 2.5... and on a cross-country drive, he could stop at any Chevy dealership across the nation for parts and service! So, no apologies to the purists. I couldn't argue with that reasoning.
The things people will invent to make themselves feel better