I am not a motorcycle guy. I have a opportunity to buy 2 old Harley's with suicide clutches. I have not seen these bikes yet. These bikes have been in this old mans basement for years. My question, i have researched these bikes but still have no idea the difference between a panhead and knuclehead. I look at pictures but still in the dark. Is there anything when i look at these bikes motors that will just jump out at me and i say yep, that is a knucklehead or panhead. It is going to be a couple weeks before i get to buy them. Old man is in nursing home and his daughter who is selling them just had some kind of surgery. I will post pictures if anyone is interested. I hope this is going to be my best garage pic ever but you never know. Thanks