Holley alcohol jets are specially designed to work only with the following model 4150 HP carburetors: 0-80542 (650 CFM), 0-80535 (750 CFM), and 0-80498 (950 CFM). The unique metering blocks used with these carburetors are designed to accept the physically larger size of this main jet. Two lengths are available: a standard length jet and an extended length jet. The standard length jet can be used with a stock, unmodified, float; the extended length jet is like a jet with a built-in slosh tube, and must be used with a specially-modified notched float, for clearance.
