Most carburetor/TBI intake manifolds also have coolant crossover passages that connect the heads on the left and right cylinder banks.

Name: Most carburetor/TBI intake manifolds also have coolant crossover passages that connect the heads on the left and right cylinder banks.
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These coolant crossover passages help in warming the intake manifold to improve the vaporization of the fuel, which in turn enhances the engine's overall efficiency and performance.

Most Carburetor/TBI Intake Manifolds Also Have Coolant Crossover Passages That