Just probe the knock sensor wire or plug while connected for about 2.5 volts and 5 volts disconnected. Just print that stuff for your dad, if he has been around a Digital Volt Meter it will all make sense.

I understand the LT4 knock module plugs in and is less sensative for that aluminum head roller rocker design. I just don't understand why it also has differant KS part numbers and test procedure. But it's been done for so long I just took it for granted it worked untill I looked into it? Since it has worked for so many I don't think it's your issue, just have a hard time understanding how with the facts...