257HS 2863257 upper 383, 440, 440+6 with 26 inch radiator B and E-body, 69-71$35.00
Since the car / broadcast sheet we are dealing with here is the "57" I deleted the other text, too confusing.
Please forgive me.
That said, the parts book and Frank are BOTH right from what I can see?
The parts book says the 2863 257 hose is for 383 & 440 with AC & / or maximum cooling.
AC cars and maximum cooling cars for the model year in question (1970) both used the 26" radiator.
Frank does not mention AC, but you could not get AC without the 26" radiator, so the catalog entry may be a little vague by omission, but it is accurate.
