I always blocked mine. I never noticed anything other than a cooler intake manifold. Cool dense intake air makes more horsepower the way I see it. I regularly started my cars in freezing temps with no problem. I think the fuel is atomized by the venturi. Vaporization is another thing. Not sure how much effect the crossover has once the engine is fully warmed up. Seems like the purposed of the crossover is to warm the intake quicker, on start-up, in cold weather. This warms the intake charge up a little when the chambers are ice cold. Helps the pig light up a little better. Especially on emissions mixtures. All probably splitting hairs over very little consequence. Do what makes you sleep well. Lol!
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