This build diary shows how to do basic things. This is ordering flow bench testing. The standard suction for flow bench data in most applications is 28 inches of water. It is possible to use a bench with as little as 10 inches of suck and to convert it to 28 inches using equations. This is adequate for most situations with non complex air flow. The plenums may have complex internal flow patterns with turbulence losses. A flow bench that can pull a full 28 inches is chosen to do the work.
The flows are measured at various valve lifts. There is little chance a lift over 0.45 inches will be used on this engine due to geometric limitations like the cam lobes being to big for the lifters. Tests will be done up to 0.45 lift with 0.025 increments.
The exhaust port is often fitted with a little stub to resemble an exhaust system like shown in the first foto. Port flow data for the head, only, is used in many computer programs. The additional losses in the intake system are calculated by other methods. Flow data for the entire intake system is what I am currently using in the programs. Intake losses in the manifold, carb, filter, etc are being "double counted" at present. Flow data for the cylinder head, alone, will be ordered. The second pix shows the intake side of the head. The valves will be in place during the testing.