Rex, it is likely one of the sleeves has leaking orings at the bottom where is contacts the block. I would pull the sleeves, clean the sleeves and the seating surface using a scotch brite pad, get new o-rings( ensure they are not twisted when on the sleeve, and then use olive oil to lube them up and slide them back into the bore. You can gamble and do one cylinder or do them all. I would also look at the block between cylinders to see if there is a crack. With the ferocity of your leak it is likely a oring went, using bars leaks will not do, pull the sleeve and have a look.