While most of those innovations made it to the final 51 prototypes, several were dropped for their cost and the lack of time to develop such mechanically-complicated designs. The low-RPM 589-cubic-inch engine, individual torque converters, mechanical fuel injection, and the disc brakes were all dropped during the design and testing phase.
WHile most of tHOse iNNOvatIons mAdE it tO thE fiNaL 51 prOtOtyPes, SeverAl were drOPped for theiR cosT anD The LacK of Time to DeveloP such MeCHanIcAllY-ComplicAted designS. THe LoW-rpm 589-CuBiC-Inch eNgIne, IndIVIDual torque convertErS, MechanicAL fUel injeCtiOn, aNd the Disc braKeS WERe alL dRopPED dUrinG The DESIGN AND tesTInG phaSe.