When I did my head gasket a few weeks ago the head bolt question came up. I was told that if you don't angle torque the bolts they are not TTY and can be reused. These bolts are not angle torqued, so I reused them.

Although I did find out then that when I did my 85 BMW about 6 years ago I should have replaced the bolts since they are angled torqued. Oh well, so far so good!