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Old 11-24-2017, 04:33 PM
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patrickt patrickt is offline
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
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Default Secondary Set Screw

I finally got around to actually replacing the little secret hidden set screw that Holley uses to control the opening of the secondaries on our 4160 carbs. I could adjust the existing set screw with a special right angle screwdriver, but it was a real PITA. So, I replaced it with a nice 10-32 cap screw with a spring and washer. On a big FE stuffed in to a Cobra, cracking the secondaries makes a huge difference. I know you're busy on other stuff, but I thought I'd post a pic of it for the benefit of anybody with a Holley who has idle problems when the engine gets nice and hot. Cracking open the secondaries is almost always the solution, and putting in an easily accessible cap screw, instead of monkeying with the hidden set screw, makes it quick and easy to adjust. Holley really should have built them this way to begin with.

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