The ITB adapter has some threaded holes beneath. Every throttle will likely be plumbed to a distribution block, that may be fed into the MAP sensor. It may even be connected to the idle Manage valve. Northwest Motors is certainly the ideal engine home I’ve ever accomplished business enterprise with. https://4age-blacktop-engine-for48147.wikigdia.com/6934842/not_known_facts_about_4age_20v_itbs