Attaches to Holley 4150 (750 cfm, aka 4779-9). I have never been able to attach a secondary ileum without leaking. After about the third disassembly I examined everything very carefully. It turned out that the double thread nut (which threads into the carburetor fuel tank and then gets the fuel rail packing nut) was very slightly crooked where it attached to the fuel rail nut and the packing nut was therefore easy never sits properly. I took everything to my local hot rod shop just to double check things and he immediately agreed. Luckily he had some of the best parts (used but like new) and was kind enough to put them together on my carb right away. advertised part on the Holley website. In retrospect, it's pretty weak.
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