I have learned two things about weigh placement in my short dirt racing career, one is get the biggest fuel cell you can so you can easily add and remove weight when you want it. I only use 5 gallons of race fuel in a 25 lap main event, but I have a 22 gallon fuel cell. The second is how important the weight placement is behind the rear axle center line as it creates "swing weight" the weight right above the rear axle is for traction and the fuel cell and rear weight creates swing weight. Depending on driving style you want some or none. Like was said before the when the car spins and has lots of tail weight or swing weight it begins to act like a rain drop and the weight leads the way for the rest of the car.
Rodger
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