[CompClassics]

We actually “pumped” the engine cylinders to determine volume.
As far as “tricks” we had people plasma spraying aluminum block with iron for the magnetic check. There is a Cobra racer from Canada that went so far as to run a flat plane crank, the sound gave that engine away.
On our own engines we ran titanium, rods, valves, retainers etc. to lighten anything and everything we could.