Porsche torque plates
I found this earlier thread which doesn't shed much light but I am reasonably sure that the practice is worthwhile.
I have spoken to someone that believes that Male have a clamping feature on the machine used for cylinder production but I have no proof that this is correct.
It is certainly common practice on Nikasil Motor Cycle Barrels and is a recommended practice on BMW Air Cooled Twin and Harley Cylinders according to my local bike repair shop.
We plan to make a fixture and measure the deformation that occurs when the cylinder is clamped and then make a decison.