Keith,
No it's not just your problem. I have noticed it too on my set from Taurus. What I did is that I did place it without any changes on top of the WNW D.III engine, but the gear house at the back of the engine with the shaft driving it from below from the crank axle is a little bit pushed to the back. Not more than 0,5mm I guess but I can measure it more exact if you like. It also means exactly what you expect. The front rocker box is therefore closer to the valves (in the length of the cam shaft) than at the back. In the end it is almost completely camouflaged by the rocker arms which you abolutely must install parallel to the front of the rocker boxes, when looking at it from the top. If you look carefully at the pictures in my thread for the LVA Fokker D.VII you will notice this if you look carefully.
Is is a known problem when producing resin parts. Resin shrinks a little bit after pooring the liquid resin in the mould when it cools down. A kit producer explained to me that they do take this quality of resin production into account, but it is difficult to get it exactly right. It means that your master model, with which you make the first mould, should be a tiny bit larger than the product you want to make afterwards. Small items will never show this problem.
I hope you understand my perhaps somewhat cryptic descriptions.
regards,
Ivo
