If someone is considering the BLP BX4 main body be aware that Holley air bleeds won't work in them unless they are turned down. I made a fixture to use in my lathe out of a piece of 3/4" aluminum round stock.

When I bought my body there was nothing in the description about the difference in the bleeds. When I received mine I was somewhat pi$$ed that my bleeds wouldn't work. The guys BLP stepped up and sent me what I needed and now there is a note at the bottom of the web page noting that BLP bleeds are needed.