the head gasket was used to place the bolt holes, the brick was tapped for a spark plug, and a bit of the inside was Dremeled out for the valves. After attaching the JB Weld cylinder head to a ...

you have the test cylinder head mounted on a dummy cylinder that is in turn attached to the bench. In the test, you blow air past the partly open exhaust valve and outward through the port.

Overhead-valve internal-combustion engines, in which the valves are located in the cylinder head and actuated by a block-mounted camshaft via pushrods, go way back in automotive history.