Not quite true.Its a kit car, put any engine you want in it.
Now could you modify the frame and fit another engine in there, sure but I have a feeling it will require removing the existing bracing and welding in new.factoryfive.com said:What engine does the car use? The GTM utilizes the power plant from a C5 Corvette – the LS1 or LS6 (Z06 Corvette).
Can I use a different engine? To date, we have not built a GTM using a non LS platform engine. However, we have built a GTM using the potent 505 hp LS7 from the C6 ZO6 Corvette. Call or email us for the details on parts and modifications necessary to bolt this Ferrari killer into your GTM!