Cometic Head Gasket

You might borrow a rad pump tool & pump it up to 15 lbs when hot to pinpoint where it's coming from. Speedway mtrs has a 6" long 1&3/4" metal hose extension for cheap and drill a hole in it & add a valve stem and a pair of junk rad hoses cut to length & sub it in for your top hose and air chuck pump it up to 15 lbs.