Crane Cams Pro-Curve Billet Distributors are designed for street or all-out race and are accurate to +/- .5 degrees at all RPM levels! The magnetic trigger plug works with most Crane Cams Ignitions plus many others. Features 9 electronically pre-programmed mechanical advance curves, 3 electronically pre-programmed 'vacuum' advance curves and a zero position provides advance lock-out for crank trigger ignitions. Photo-etched, stainless steel trigger disc eliminates flex and corrosion while the aircraft quality upper bearing for long life and precision alignment. The adjustable slip collar (GM applications) is designed for machined block heights. The billet 6061-T6 aluminum housing and composite lower housing bearing holds true alignment. A precision M-A-P sensor is built-in to monitor and adjust for engine load. A solid brass cap terminals ensure maximum current conductivity. These distributors are fully sealed in urethane to keep out dirt, oil, and moisture.