I cut the holes in my 70 Duster, I got the duel scoops. It really cooled the engine compartment down. Before the holes you could feel the heat from the engine bay when driving. I parked once in a friends garage and he mentioned how much heat it threw off. After the holes the engine bay was definitely cooler. The engine never did overheat before the holes but it did run cooler after them. I didn't seal them to the carb, just let the air flow through. Was freaking nervous cutting a 4 1/8 hole in that hood though!! I have never really noticed water getting into the engine compartment, don't drive it in the rain much and when washing it I don't shoot the hose directly in there.
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