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Have blocked off the exhaust crossover on a few of my engines. Mostly Pontiacs. It does make a profound difference. That crossover was put there for a reason. Heat under the plenum helps with cold starting, fuel atomization - basically helps even things out in varying conditions on a street driven vehicle. If you are only interested in acceleration and don't mind waiting for it to heat up on cold mornings, don't sweat it's absence.
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