Progress on the cylinder work

The cylinders are really complicated castings, very expensive to make and a mistake is even more expensive. This series cylinders A-1-329/330 are the highest production part number we have found and was introduced on the D-C-7 engine, We are using the D-C-8 variant which appears to be the best configuration. However the D-C-8 had 1.5" valve travel and the previous model had 1.25" travel........ was this difference made up in the dimensions of the valve relative to the ports..... or was there another block.....E23 had earlier blocks with absolutely no facility to blow them through to warm up and unsurprisingly these blocks had a lot of welding repairs. Shown in the images is the scan, the model drawn from the scan , the cores and finally finish allowance for machining added to the model. Now I just have to be confident this is the correct block....... more coffee needed