Right, i have just bought a cally turbo, with what i think is a non coscast head. It has an core plug at the end and no raise round the heater outlet. However was EVERY calibra turbo fitted with a coscast head?? Is there major problem goign to occure using the GM head... or is it a coscast in disguise (I have been told, some of the ealier turbos, and mine is a K plate) did have the head, just with the core plug as well.
thanks in advance for help..