heavy duty lower arms The standard control arm has one round and one oval bushing. The HD has two round bushings, for less deflection under corrnering and braking loads. At least this applies to A body chevys. An F-41 arm would have two round bushings. The rubber is supposed to be firmer also. All big block chevy A bodies had the arms with two round bushings, whether F-41 or not.
Really?? It must Chevy only because in 18 years and 12 buicks, I have not seen one single oval bushing (four door parts cars, skylarks, big and small block GS's,including two with F41 option on the buildsheet etc) The assembly manual F41 shows nothing of that for our cars. Interesting stuff!! later Tim
