Changed Oil then…

Hey all- I need your thoughts and opinions.


So my fresh rebuilt 383 I've been runnin' through the break in time, using straight 30w Brad Penn break-in oil. It's what the rebuilders put in. I ran it per the recommendations.

I changed it this weekend to 10-30w partial synthetic, again Brad Penn brand. This again with the recommendation of the rebuilders.

As soon as I started her up again for the first time after the oil change, the oil pressure light flickered...flickered...then is steady on now. The oil level is spot on. I've read 4qts all the way up to 6qts. is the capacity, I went with 5.5 qts. Still, the oil pressure light is on.

WHAT HAPPENED??