spark plug with tire valve

[spongebob]

i neede something to put air pressure into the cylinder on my 265 flathead to test if the valves are leaking. i think i saw somewhere that you can add a tire valve to an old spark plug to do this. anyone know the way to make this tool? thanks....dennis

[plymouthcranbrook]

If you google cylinder leak down tester adapter you should get lots of information 

[Sniper]

If you have a compression tester you can use the hose from it once you remove the schrader valve