Because today's racing engines run at higher RPM levels with harsh cam profiles
365 in Shank
Mounting Bracket Included
500" OD guides
Adjustable pointer can be calibrated at the race track
Mr. Gasket Differential Gasket - 81 Rear Ignition Timing Tape Because today's racing engines runMr. Gasket Differential Gasket 81 Rear Precision Cut High Quality Materials Reusable Applications include: 300, 330, 440, 880, Barracuda, Belvedere, Belvedere Ii, Challenger, Charger, Coronet, Cuda, Custom, Dart, Duster, Fleet Special, Fury, Fury I, Fury Ii, Fury IIIc, Gran Fury Vehicle Applications: 1961 1964 Plymouth Savoy 1964 1974 Plymouth Barracuda 1970 1974 Plymouth Cuda 1961 1961 Dodge Custom 1962 1965 Dodge 880 1966 1974 Dodge Charger 1961