Chevrolet Big Block Engine - The Big-Block From Hell
15. Because we chose low-tension piston rings, we needed a vacuum pump to improve ring seal in the cylinder. Dave made a custom mount for Moroso's three-vane pump, which is driven by a V-belt and 4-inch crank pulley. The pump draws through the valve cover and exhausts into a Moroso tank mounted off the front motor plate. The pump pulled 15 inches of vacuum during dyno testing and didn't require a pressure release valve.
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