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Adjusting the secondary butterflies on a Holley?

2K views 5 replies 3 participants last post by  RWENUTS 
#1 ·
Would something like this work on a Holley Street Avenger 670 with vacuum secondaries, or should I just put in a new allen screw from the top of the throttle plate. Any suggestions on what you guys have done to make adjusting the secondary butterflies easier. :confused:

ProformParts.com - ADJUSTABLE SECONDARY CAM BRACKET
 
#5 ·
secondary screw location

Usually - on most manifolds there is nothing in the way below the carb. But...it is often very painful to get on the screw with a driver (regardless of the type of head you install) from the bottom due to heat and other obstructions.

A fellow showed me the "hillbilly" way and I've used it ever since. Replace the screw with a longer fully threaded one - that sticks out far eough to tweak it with needle nose pliers. Doesn't have to be way too long - just enough.
 
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