Yeah, It's pretty normal. The bolts go through into the water jacket. All I can say is load up on the Permatex Ultra-Blue. That's what I've always done in the past, and have'nt had a leak yet. I ran into the very same issue 15 years ago when I saw that one of my bolts was leaking. I suggest that you change your all your bolts as well. The original bolts fatigue and the diameters of the bolts get eaten away from the water over years of use. I had all original bolts in mine. They will go in a box, and all AMK fastners will go in their place. You really want to install new bolts here...Don't know what else to say.. I got new AMK Concours bolts for the water pump and the thermostat housing from NPD.. Good stuff...Enough said..
Tony K.