2.7's always had this problem. That is why '74 -'77 911 are hard to sell. Could be an exhaust leak or a head stud has pulled away from the case.( stripped )
Torque your heads to find out. This can be done with the engine in the car.
.............When the engine was out did you replace the head studs with Raceware studs? Should have.
Stripped head studs are a common occurance on 74-77 911's.
Good Luck
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