Originally Posted by BigBadLou

Dang, I haven't seen electric flaps in a long time. I actually have the original electric solenoid off one old car, I'll have to dig it up and check the part number, that should be interesting. Cannot remember, however, whether it came off a Z28 or a Firebird, sorry.

Also, the electric hood opening was connected to a vacuum switch, though the oil pressure and cold override switches. At WOT and with engine running and warmed up, the flaps would open and introduce cool air directly to the air cleaner.
diagram here

Lou