You can contact Roush via telephone 800-597-6874 (
http://www.roushperformance.com/) and they can tell you about the engine. Ask for the engine department. They keep records about the engines they build. They'll ask you for the engine #. Example, mine is #141. If the engine has the Roush crome valve covers, the number will be on the valve covers. I have a Roush 427R in my Superformance. Since I'm the second owner of the car, I had questions regarding the engine before and after purchasing the car.