Does anyone know where I can find hi-temp engine paint in Viper Red?
Bill, just about any catalyzed urethane paint (paint you have to mix and spray through a gun) will work on engines as long as the prep and prime are done right. All you need is the paint code, which I believe is R4 red, if I remember right from my Dodge dealership days.
There is in spray cans Hi-temp engine paint by Duplicolor that has a Ford red that is a pretty vibrant red I have used before. Not the same, but a much easier way to go for the do it your-selfer, although prep work is still key to do.
Google is your friend.