These MSD Street Fire HEI distributors are packed with high-quality features and components. These distributors use a centrifugal advance assembly with coated weights and welded weight pins (not just pressed in). The Street Fires are fit with the same gear that is used on MSD Pro-Billet models. The metallurgy of this gear has been refined for years to perform through the harshest conditions. Inside the distributors, the ignition module and coil work together to produce a stout spark to light the fuel mixture for great performance. The high voltage is transferred through a specially designed rotor to the brass terminals of the distributor cap and out to the plugs. The MSD Street Fire distributors prove that quality does not have to be expensive!