I am atempting to convince a co worker to attend NES on Saturday. He is a Nascar fan, yes there are still a few out there but has never seen or attended a dirt race. Expaining the diffrent classes to him as far as the modifieds big block vs small block min weight and then trying to expalin Crates vs sportsman wasnt so easy.Diffrent weights, rev chip 4 barrel vs 2 barrel.....To tell you the truth I still get confused! So in somwewhat laymens terms can somone expalin the clases so I can expalin it to him. Thank you.