Duratec prototypes were Porsche designed but doubt it is a hacked off V8...it is a 60 degree V and V8s are almost always 90 degree (except for the 3.4 SHO V8 which is a 2.5L V6 with 2 cylinders grafted). The buick 3.8 V6 is a sawed off V8 and is 90 degrees..

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