For faster, easier starting, Mallory's 12V electronic ignition system delivers performance and reliability at an affordable price. This unit is a drop-in for 1936-1969 OHV-Big Twins. When using stock-heads, no head removal is required. This billet distributor utilizes the Accel selectable single/dual fire ignition module. A complete kit that comes with detailed fitting and tuning instructions and wiring harness. Features adjustable Rev Limiter.