To obtain maximum performance, many engine builders actually modify the distributor's reluctor to obtain different timing for each specific cylinder. The reluctor is CNC-machined. Reluctor; Distributor; CNC-Machined Billet Steel.
MSD Performance 8415 Distributor Accessories
MSD 8442 GM Points / MSD V8 Distributor High Performance Cap And Rotor Kit
MSD 84083 Distributor Cap for 1972-1997 Ford HEI V8 255/302/351/400/460ci
MSD 8362 Distributor Chevy HEI STREET FIRE IMCA IHRA NHRA WISSOTA Rat K&N ARCA 2
MSD 5594 Distributor for 1986-1993 Ford Mustang 5.0L
59107C MSD Electronic Distributor Cap Coil HEI for Chevrolet Bel Air 1973-1955