You, sir, may have solved the egr problem. I put a remflex 7002 gasket on there and it definitely blocks those holes off.
Looking at my Thorley header while it is mounted, I do not see how exhaust could get to these ports, unless the passage is machined into the flange itself. Can anyone confirm before I yank it?
The DT I bought is the thy-542y-o-c which is carb compliant, so it should not block the egr ports.
EDIT: Missed where you said headers have a notch in the flange. GOLD STAR FOR YOU!!
