A Side Oiler Like We've Never Seen
To provide one central point for the idle air control (IAC) sensor, manifold air pressure (MAP) sensor and power brake fitting to access the engine vacuum, Van Auken created a vacuum plenum. The plenum was made by machining a depression in a piece of 1.500-inch aluminum and welding a plate over the top of it. Eight hoses, one from each runner, are plumbed in one end of the plenum and the sensors and fitting are located on various surfaces of the plenum. The plenum bolts over the crankcase vent flange opening in the intake to seal it and not interfere with the throttle linkage or fuel rails.
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