"It mention an over the counter offer of an Edelbrock duel 4 manifold as well as an Edelbrock single 4 manifold. I assume this is the LD4B."



what year did the 273 engines change the angle of the intake to head bolts ?
i had always thought the LD4B intake was offered after the 340 was introduced, and it was intended for it ?
i have been wrong before, so it wouldn't be surprising i'm wrong on this as well.