Percolation? Heat soak? Don't drive during summer??

You had manifolds at that time too, right? Headers were installed when you did the engine bay, if I remember correctly.

Nope, have had the headers on since i got the car. The car came with a 2.5 exhaust and headers that were old but not installed. So my daughter and I cleaned them up, painted them and installed them. I did add some heat shield wrap to the passenger side, which I think traps more heat that they let leave the engine bay. Idk, my engine bay is always so damn hot both before and after.