Vacum Secondaries
Thread Starter
|
New User
Joined: Oct 2006
Posts: 15
Likes: 0
Vacum Secondaries
I'm putting a holley 4bbl carb with vacum secondaries on a freinds 79 f-150 with a 351M in it and i was wondering what to hook the vacum port for the secondaries up to? pics would be helpful too if you have them Thanks
Postmaster
Joined: Feb 2003
Posts: 4,043
Likes: 4
Do you have a pic of the carb? Holley carbs don't have an external port for the vac secondaries. It's an internal vacuum passage.
Some carbs have a tube that runs out of the passenger side secondary barrel. That tube is above the venturi. It's purpose is to provide a clean air intake for the heat riser to the automatic choke. There should be a hose/pipe from that tube, down to the passenger side exhaust manifold and another pipe from the manifold up to the choke housing.
Some carbs have a tube that runs out of the passenger side secondary barrel. That tube is above the venturi. It's purpose is to provide a clean air intake for the heat riser to the automatic choke. There should be a hose/pipe from that tube, down to the passenger side exhaust manifold and another pipe from the manifold up to the choke housing.
