This is an aluminum Chevy test engine that was casted in 1958 for the experimental CERV 1 car. You would need to Goggle CERV 1 to know more about it. I never heard of it till this past weekend. It is not known at this time when or how the twin Jetfire turbos were added to this setup but they are investigating for answers to that question. Just thought I would post them on here since it involved Jetfire turbos.