Back on the Idle-eze type modification.
I found a old picture in my files of a Old School Holley modded for Idle Air By-pass with the air cleaner stud used to close off part of the air by-pass system to the lower center part of the carb.
Basically the way it works you drill a bypass hole at an angle towards the air cleaner stud boss.
Then you drill a deeper hole downward from the air cleaner stud boss into the cavity in the center of the Holley carb.
Now if you need additional air you back off (raise) the long air cleaner stud (threaded rod) slightly and let more air pass thru the drilled by-pass hole into the center chamber and then on to the area under the 4 throttle blades. Simple, works well and most do not even know it is there. Reinstall the air cleaner and see if the idle has changed slightly with the air cleaner installed.
Some old Chebby carbs had a PCV valve connection on the SIDE if the carb (see Pic) You could take that fitting out and put in a fixed jet that would allow additional air same as the air cleaner stud mod but again hard to find one of those old chebby 3310 type carbs.
Tom V.
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"Engineers do stuff for reasons" Tom Vaught
Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward.
Last edited by Tom Vaught; 11-30-2017 at 11:01 PM.
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