I have been racing 240Z's since 1990 and have owned them even longer. The aluminum finned drum brakes are shown/pictured in several places in the original shop manual, they are also noted in the factory sales brochures I have. They are original equipment. Since the factory aluminum units are no longer available I feel changing over to the later 280ZX rear disc would be ok. Yes, I know it pushes the upadate back date rule. But SCCA "let the horse out of the barn" twenty years ago when they allowed the General Motors guys to change over from rear drums and bearings and axle assembly on the Olds Calais and Acheivea to disc. So a precedent has been set. I do not want to reverse that decision because it would take out many needed competitors and participatants in the club. I we should look forward and as any of these vehicles age and parts are no longer avaliable. I feel an update is neccessary to keep grassroots motorsports alive and going forward.
Thanks
Steve Barth Ann Arbor,Mi - Detroit/GreatLakes Region
ITS Datsun 240Z