Quote:
Originally Posted by pontiac jack
Two-barrel carbs with vacuum secondaries? You lost me, Tom...
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Jack, This is what a Vacuum Secondary 2BBL Holley carburetor Looks like:
The Center carb on the 6-pack has the same vacuum signal pick-up as a normal 780 Holley carb.
The end carbs are connected to the center carb 'signal Port" with vacuum hoses.
The end carbs have a "Kill Bleed" port inside the venturi area (just like the rear barrels of a 780 cfm vacuum carb. The only real difference between a normal 780 vacuum secondary carb and a vacuum secondary 6-pack set-up is that the signal from the center carb opens TWO sets of butterflys vs on set on the 780 carb.
67ProTouringCatalina, These Links have a lot of good info on the Holley "Tri-Power" carburetors:
http://www.ford6v.com/ford6vtech/ford6vtech.htm
http://www.ford6v.com/photo_gallery/photo_gallery.htm
Tom Vaught
ps Yeh! I have worked on a few of them over the years. No one was aware of the sleeved venturi carbs until I mentioned that we designed them that way to make them work right on the center carb of the 429 Super Cobra Jet Engine. Later the owner of the linked site came across a guy who had a "sleeved carb" experimental Tri-power. The last 2 pics are of that carb.