I deleted the thread, sorry about that. If I'm understanding correctly, both the Turbo and non-turbo used the same block, I understand that external parts were added on ie: Turbo / Intercooler, ect. Am I correct that a different crank and piston were used. I called my local Mazda dealer and they could not answer the stamp question, I tried Mazda USA Headquarter and they blew me off saying the car was to old!