Smoking (bad for it's health)

When I start the car when it has been sitting a while it will smoke a little. It doesn't do it right away. It will run a few minutes then a little blue smoke for a few seconds then stop. It doesn't do this all the time. Only once an a while. It can go for a while without doing this. I did a compression test and they are almost all the same readings. It doesn't go though any oil. I thought it might be valve guides because my heads were shot. But it still does it with the brand new Edelbrocks. Is this something I should worry about? The motor has 39000 miles.

Fred B