2 factory cars + 21 customer cars were built in 1972 with a injection 2.5L engine
2 engine type were available :
911/73 for the short stroke version ( 66mm )
911/70 for the long stroke version ( 70.4mm )
Most of the cars has hight butterfly but some engine had the slides 916 / Carrera 10
Factory option M471 and/or M491
First delivery of the 21 customers 2.5 ST :
11 for Germany
4 for Switzerland
4 for USA
1 for Spain
1 for France