I make these hoods and scoops and have 2 of the 68 Hemi Cudas, one with the pan mated to the hood and the other completely open. I actually leave the pin off the center of the rear on both cars to let some of the pressure out of the engine compartment. Sure, it comes up about 2 inches on top end , but neither one has cracked or broke in 20 years. Fiberglass is very forgiving.