Vibration??
It's not a vacuum leak, I checked for those after installing the manifold. The motor has a dead-smooth idle at 750RPM, the rest of the car vibrates as though the motor was welded to the frame (it has new motor & trans mounts). The real fun starts on hard acceleration.
It appears that the 904 in the car has a lockup torque converter, which means it's a post-1978 unit. Lockups had this hollow spline shaft with a smooth shaft sticking out the middle:
versus the non-lockups, which have a solid spline all the way to the end.
It's not a vacuum leak, I checked for those after installing the manifold. The motor has a dead-smooth idle at 750RPM, the rest of the car vibrates as though the motor was welded to the frame (it has new motor & trans mounts). The real fun starts on hard acceleration.
It appears that the 904 in the car has a lockup torque converter, which means it's a post-1978 unit. Lockups had this hollow spline shaft with a smooth shaft sticking out the middle:
versus the non-lockups, which have a solid spline all the way to the end.
