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Originally Posted by bestephen
I can follow the Stock and super stock classifications its the GT classes that I don't understand. Say I want to run a 352 engine in a 1968 Mustang. How do I determine the class?
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Get the shipping weight for the 1968 Mustang ( with the heaviest engine ) , then get the shipping weight classification sheet for the year of the 352 engine you want to run . Some times the GT engine is factored differently than the Super Stock engine factor . Once you figure out the engines HP factor then the natural class is the Shipping weight of the car divided by the GT HP engine factor . This gets you your natural class which you can adjust to the bottom of the class . Minimum weight for that class across the scales requires you add an additional 170 lbs. You are allowed to go up one class and down one class , but that's another discussion .