Blow Off Valve Question

[96lowranger]

I purchased a BOV and it has two small vacuum ports on it. One is on top of the diaphram, and one is on the bottom. Where should I run the vacuum lines to for these? I know the third port is the vent (it is much larger and is supposed to go to atmosphere or back into the intake pipe from the air cleaner).

 

[Davis]

probably on top
the one on the bottom could be regulated to adjust at what pressure differential it blows off.