Hood vents are to help dissipate the heat being trapped under the hood, also known as heatsoak. IT WILL NOT REDUCE THE OPERATING TEMP OF THE MOTOR. That's a very common misconception around here.
Heat soak is when a motor reaches a certain temp and can no longer bring the temp back down?
I think my issue of "heat" is from header. Although, I think coolant temp is better now (with 3 row radiator) post #25. I would really like the hood temps brought down. That hood gets HOT!
'97 Cherokee, 99+ intake, 62mm TB, 703 injectors (new), k&n intake, Hypertech III, 180* stat (1/8" drilled hole), 2.5" manifold 2 tail pipe (Hooker Maxflow & hi flow cat), Perf header, 4.5" zone lift, 32" GY Dura Trac, Rear head rests. Comp cam "231" & Perf head (LS1 BIG valves 2.02/1.62). 3 row alum radiator.