Adjusting the secondary butterflies on a Holley? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 08-26-2012, 01:05 PM
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Adjusting the secondary butterflies on a Holley?

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.

ProformParts.com - ADJUSTABLE SECONDARY CAM BRACKET

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Old 08-26-2012, 04:57 PM
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I took a small flat blade screwdriver, heated it a bit with a propane torch and bent a 90 in the end.
Then I could reach under and adjust it without removing the carb.
What type of a screw head does yours have?
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Old 08-26-2012, 06:07 PM
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It has the stock slot head screw...I was thinking about removing the screw and replacing it with an allen type and then re-install it from the top, where it would be a lot easier to adjust.
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Old 08-26-2012, 06:29 PM
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That works to.
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Old 08-27-2012, 08:13 AM
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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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Old 08-27-2012, 11:16 AM
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Or replace the screw with a machine screw that a 1/4 inch wrench will fit.
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