ok, well I'd forgotten about the inlets and the outlets! This appears to be the flow, and you can get a wire along from each core plug entrance to mid way along toward the centre. I've decided to acid treat just this area by blocking off all the manifold stud holes and back row of entrances into the cylinder head circulation, and then will create an acid bath there just in the pictured bits, block N/S downward.
I found the shaft beneath the centre position (the little hole, N/S) completely blocked underneath the manifold stud, and also found that there didn't appear to be any connection with the nearest head stud to that little hole centre N/S.
Can anyone add to this from their own excavations?
note, I've put this image in twice now and it goes this way up even when I rotate it 180 degrees to correct the anomoly, before uploading. So you will have to live with it!
I found the shaft beneath the centre position (the little hole, N/S) completely blocked underneath the manifold stud, and also found that there didn't appear to be any connection with the nearest head stud to that little hole centre N/S.
Can anyone add to this from their own excavations?
note, I've put this image in twice now and it goes this way up even when I rotate it 180 degrees to correct the anomoly, before uploading. So you will have to live with it!