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EC Birt started R&D and become the direct Tillotson importer in the U.S in the 1980s. Since then he has created the infinite radius venturi that is now common among racing diaphragm carburetors from both Tillotson and Ibea. That design was introduced with the Hl-348 EC developed for Super Stock and Limited Modified Carburetors and Later the HL-360, HL-355, and the even larger HL-380 for Open Modified Flathead Engines. Carroll Ford, the current owner would design and build the OHV models including the HL-334wx, HL-304WX, HL-304WXA, and HL-304WXG. We carry many of the OEM and Aftermarket parts to rebuild and blueprint the Tillotson HL Carburetors.