To allow for that Map reading from the Blacktop engine (see “load metering”) the inlet manifold includes a wider face with the facet of The top with yet another vacuum feed off each individual cylinder that brings about an integral chamber for your vacuum signal to feed the Map sensor. https://toyota4ageblacktopenginef79023.myparisblog.com/40309252/details-fiction-and-4age-20v-for-sale