I've been running the penzoil 25w50 racing oil in my low 10 second 498 bracket engine but find its quite thick and takes a long time to warm up and thin out before first run in the mornings.
I want to switch to a much thinner oil for next year and came across this interesting but long article some of you might find interesting as well.

engine oil testing

I know many of the stockers and super stockers run a light oil and gain some ET, but for regular bracket racing do some of you run thin oil successfully with minimal engine wear over a season or two?