not sure what engine I have

[harry-ct]

I just purchased a restoration project the chasis is a 1974 targa but I think the motor may be from a 77 911s, the case # is 901 101.101.7R the engine # 6273424. the heads # 901 105.111.1R what is a 7n case ? are these prone to the stud pulling problems?

[JSDSKI]

7r case is good... best mag case... especially if non California car.
Serial number indicates a 911/85 type "S" from a Targa manufactured between August 76 to July 77.

[Wayne 962]

Engine Type 911/85.

-Wayne