Guys - I've got a 350 Chevy in my 54 Kaiser project car and working out issues as I go. One of them is some kind of adapter that will go into the cylinder head (I removed the plug). The fan thermostat switch has a smaller thread size than the plug I took out and hoping there's something I can buy to make it all fit.
Would anyone know what size to get? This switch has SAE (?) threads. Thanks!