Rochester Quadrajet Carburetor - Quadrajet Quotient - Junkyard-Crawler Tech
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Pontiac engineering used two unique Model 4Ms to meet the airflow demands of its Super Duty 455 and 455 H.O. engines. The SD-455 casting had a larger-diameter primary (left) while the high-flow '71 casting (right) was also used on D-port 400 and 455ci engines with manual trans and cast without outer velocity boosters. View Related Article
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