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I found it easy to do with motor in the car. To me it would be a ton more work to remove the motor and transaxle to do that. I also don't have an engine stand or place to put one if I did.
With the back of car up on jackstands and bumper and rear engine mount removed lower back of motor down 6-8 inches on to a jackstand. Then remove the chain case covers and just do it.
I replaced both 964 cams, all the rocker arms and shafts, left and right chains (master link type), cam sprockets, idler sprockets and shafts at the same time.
I was able to comfortably sit crosslegged on the ground behind the car while doing it in my driveway and everything was at the right hight right in front of me. I lay on my side on the ground while changing and adjusting exhaust valve rocker arms. That doesn't bother me much.
Only time I had to stand up was when using the special tool inserted into the cam sprocket holes to keep it from turning with my right hand while I pulled a click type torque wrench with my left hand to tighten the bolt. I was standing next to the right rear tail light while doing that.
Mine is an '87 turbo with the bolt that holds the cam sprocket on.
I snugged down the two bolts a bunch of times and rechecked cam timing on both cams until I had them as close as I could get them. Then I torqued the two oiled bolts and checked timing again.
That little pin that inserts into a hole in the cam sprcoket is not a precision fit and cam timing can be moved for and aft a little while it's in a hole before you tighten the bolt (or big nut on older motors) so you have to fiddle with it and repeat until you get it where you want it.
Just takes patience and it's fun and satisfying on your own car as long as you have the time and a comfortable place to do it.
I did all that around 6 years ago and it's run perfect ever since.
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