MSD designed this 8987 Start and Step Timing Control Box for racers running locked-out timing on streep/strip cars with slow engine cranks due to advanced timing or high compression. This handy controller lets you select a 5, 10, 15 or 20 degree of retard while the engine cranks to lessen the pressure and allow the engine to start easier. The Start and Step also features a single stage of retard that is ideal for nitrous engines. Easily connects to magnetic pickups, has a points input and also works on 4, 6 or 8-cylinder engines. MSD 8987 Start and Step Timing Control Box Features: Adjustable: Yes Adjustment Style: Knob MSD Ignition Box Required: Yes Compatible with Multiple Coil Ignitions: Yes Controller Activation: Programmable Quantity: Sold individually From street cruisers to Top Fuel dragsters, MSD's ignition systems have been the industry leader for over 40 years. MSD continues to push the envelope with cutting-edge ignition technology as well as intake manifolds and EFI systems.