[700rpm]

Get a diagram for proper torqueing sequence. This is important! It may be that that was not followed when the head was last off. Also, I would back off the nuts about a half turn before retorqueing. Just a little bit, not more than a half turn back, then torque. Some oldtimers suggest backing them all off a couple turns before retorqueing. Then retorque in proper sequence. If you do it that way, drain your cooling system so no water leaks into the crankcase.

Torque to 55 lbs.

After that procedure, and after you've refilled the water and run it sufficiently to get it fully warmed up, retorque again, in sequence. After about another half hour of good running, I retorque again. You should too.

If it still leaks after all that, but not too badly, put some good quality sealant in the cooling system. If it still leaks (I'd be surprised, unless there's a crack or warpage), then pull the head.