what are these vents for?

[kennedy759]

on my 67 ca78 there is a vent nipple on the rear of each cylinder, they also hold a clip for the spark plug wires, what do these vents do and where does the vent tube go to?

[mike in idaho]

They vent the intake valve guides to keep vacuum from sucking oil into the engine while coasting in gear. They were attached to a teed line that plugged into the front of one air cleaner. Honda did away with them on the later engines.

[kennedy759]

my air cleaner has 2 ports, they are broke off, is this where these line go to?

[LOUD MOUSE]

Your air cleaner has 2 HOLES.
The top vent goes in one and the other tube goes in one. ..............lm

[kennedy759]

got it thanks