It is the size of the tubes/rows that provide the best cooling. Usually at a premium price. FITS: 1966-1972 B-BODY'S AND E-BODY'S BIG BLOCKS WITH 26" RADIATOR. BUILT IN TRANSMISSION COOLER.
Red 383 Road Runner Air Cleaner Lid Decal For 1968-1970 Plymouth Road Runner
Parking Brake Cable fits 1971-1974 Plymouth Road Runner Road Runner,Satellite Ro
1966-1972 Mopar B & E Body Aluminum 26" Radiator Road Runner Challenger Cuda
22" Radiator 1966 - 1969 Charger Cornet Superbee Road Runner RT B-Body Mopar
1970-73 Challenger Charger Coronet Cuda Road Runner; Radiator Fan Shroud; 26";
22" Radiator 1966-1969 Charger Cornet Superbee Road Runner RT Mopar B-Body Black