Livernois Motorsports said:
I don't think it matters. I just set mine in the way I was holding it. No problems.
Dave
I stand corrected. 12 o'clock it is.
You were right. Per LME the jiggle valve in these cars is not required to be in 12 o'clock position. Some cars may have a small notch in the gasket that requires to be lined up though.