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Even for a big-block, with fuel injectors sitting downstream there is only the need for a 4150-style throttle body. There are no boosters sitting in the middle of the throttle bores to clog up the airflow so there is no need for a 4500 Dominator throttle body, unless the engine is well past 1,000 hp. A trick used by many EFI experts is to use a soft rubber hose (as seen here) to lead to the MAP sensor instead of a braided steel line. The soft rubber absorbs some of the pulsing from the cam and gives a smoother signal to the sensor. View Related Article
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