Pinto's are alloy construction and just have a alternator to drive.
Cossies are cast iron and stronger due to the twin pulley / ribbed belt design which drives pas,alternator, and AC on some cars.

One of the first pinto's to use the stronger type of water pump was the 2.0i sport sierras. From then on they used the stronger type.
same with 2.0 mk3 Granada's