Designed for hardcore racing! Features include blended and equalized venturis, fixture aligned boosters, milled choke horn (4150) high flow baseplate, squared metering gasket surfaces, screw-in air bleeds, clearance floats (drag race includes jet extensions), custom calibrated for drag race or circle track applications and progressive link-style linkage with PCI 1:1 link included. Plus all the features of their Plus Series carburetors (clear sight plugs, tube squirters, PCIsquirter screws, re-usable bowl screw and squirter gaskets, 4 corner idle, PCI idle screws, hex bowl screws and quick jet change dominator bowls).