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I have my 78 f150 4x4 (78 cab, 76 frame, motor, trans, etc) all apart, and I have a few questions about vacuum lines. It is a 390 with a 4 barrel holley 4160 on it. My questions are: the flap for air intake on the air cleaner cover, where is it supposed to be connected to? And also there is a vaccum suction device on the drivers side exhaust pipe right next to the manifold, first of all, what is it, and where is the vacuum tube supposed to go on that? I took a picture of that for ya's.
Originally Posted by vaccum suction device on the drivers side exhaust pipe right next to the manifold, first of all, what is it, and where is the vacuum tube supposed to go on that? I took a picture of that for ya's.
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I believe in the picture its called a heat riser and are a bad design from what I remember , I alway kept them in open position an unhooked , you can google more information about how there suppose to work ,but I never like them
