Problem solved - and it was simple. Thanks Kevin and Dan for your advice. I tightened the packing nut just a wee titch and it leaked even more. I drained the coolant, removed the valve and cleaned it up. Then I wrapped the valve stem and packing nut threads in teflon tape and voila - no leak. With the coolant drained I also replaced all the hoses since they'd been in quite a while. Thanks again for the help!
Attachments
Heater shut off valve 2.jpg (54.44 KB, 39 downloads)
Heater shut off valve 3.jpg (92.2 KB, 39 downloads)

~Denny
1953 Chevy 3100
w/1960 261 cid, 848 head | Weber 32/36 progressive 2 barrel carb. | Three on the tree & 3:55 torque tube | 12 V w/Gener-Nator & 6 V starter
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1998 Chevy Suburban 350 ci awd/4wd