These cars have a huge potential for not just fuel economy which has been proven by CJ Centurion #3 car but also with performance. By adding the J type overdrive to the Centurions Spitfire transmission CJ was able to give it longer legs and transform it into a freeway capable car.
The difference was pretty apparent the original Centurion design was rated as having a top speed of 65mph. Centurion #3 with the J type overdrive unit, GT6 3.27 rear differential and 850cc engine gave it a new top speed of 88mph.
A person could easily beef up the Kubota engine and give it performance on par with the original Spitfire. This performance level would be more than adequate for today's standards.
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