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I have a Cross-Winds air gap style intake with a Holley using the LT-1 style drop base air cleaner on my 409 SBC and am still able to use a 3.75" tall filter element.
Elm
Yes. I'm running a Victor Jr. and 750 DP. I do have a standard nut instead of the wingnut though.
to know what you really got go to the toy store and get some silly puddy and roll up five 1" ***** and place one on the carb stud and place the rest around the top outside of the air cleaner, gently close the hood open the hood and measure their thickness.
