Overhaul 1976 RWC A4 cylinder hone?

[dplidr@gmail.com]

1976 RWC overhaul - stud hole bottoms

As Ron wrote: gentle and careful to open up the bottoms so that you can successfully chase the threads with a tap. The stud holes at the top left (near the coil-mounting holes on the side) do not join the water jacket. All the others do poke through. See the second close-in photo showing the ridge at the bottom that should be removed.

[scratchee]

All the others do poke through. See the second close-in photo showing the ridge at the bottom that should be removed.

Thanks, that's extremely helpful. I can see that a good first step will be to get the cooling passages all cleaned out, then I can work on the threaded holes!