1955 Chevy Transmission Rebuild - The 400 club
Since high-line pressure in Third gear is one key to making the Turbo 400 live, Kilgore machines the exhaust portion of the boost valve (arrow) in the back of the pump to ensure that high volumes of fluid at high rpm won't drive the pressure up. This creates a stable line pressure at higher engine speeds. Kilgore says it's common for line pressure to increase in high gear, which is an unnecessary power drain. View Related Article
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