I figured I would read around for crate engines. Wouldn't the engines have a different part number if something was changed? From the fordracingparts.com website part M-6007-M50 looks to be what comes stock in the cars. However when you go to this page
http://www.fordracingparts.com/crateengine/Main.asp#mod, it says the horsepower rating is 412 but when you click on the link it says the horsepower is 420. Weird.
My original thought when I saw the hp difference was either an intake or exhaust change. It seems like that would be the case since there are no different part numbers for the 412hp and 420hp motors. Thoughts?
-Alex