Quick fuel carburetors are amongst the highest quality carburetors on the market. They are hand assembled and engine tested here in the USA. Carburetor has been PFTE high temperature coated for a long lasting durable finish. The BD-1957 is a single inlet carburetor with electric choke. Other standard features include changeable idle air & high speed bleeds and vacuum secondaries with Quickset adjustment. The SL-600-VS has 1.312" venturies and 1-9/16" throttle bore. Carburetor includes kickdown linkage for Ford applications. We are a stocking Quick Fuel distributor and offer many different sizes, finishes and options so give us a call if you don't see what you are looking for.