Ok, I'm lazy and don't want to make a coolant mess on my garage. But I'm considering putting some braided heater hoses on my car and need to know if they are 5/8" or 3/4" so I order the right ones. The ones on the car do not have any marking so I'm unable to tell just visually, but they appear to be 3/4". It's a 351C in a 1970 Cougar. Thanks in advance.