For those wanting an easy to install thermostat housing that allows use of the Standard GT radiator house, and a standard thermostat.. but is running a 2.2 or a 2.4L head and EFI. This would work for anyone doing a 2.2L/2.4L head with custom EFI or the Motronic Opel setup as it is compact and has both ports for the EFI sensor and the gauge cluster sensor.
I am working with a fellow in Europe that has 3D modeled such a thing.. It wouldn't have all the ports and require all the gymnastics the standard 75 GT/E housing and the 2.2/2.4L housings require. He originally created it and 3D printed it for use on a 16V conversion. They aren't cheap as they are CNC MIlled from Billet Aluminum.. ($200 and shipping from Europe and we will need to get 10 made, if we are to get them made at all. Curious how many would be interested. I am in for 3.
You can see in the pictures the original 2.4L uses a funky hose then goes to another hose. We found this setup does not seem to report the temperature a 100% accurate to the dash, and it gets in the way. of linkage and intake a bit. Look a lot cleaner and would avoid needing special lower radiator hose(s). The Standard GT/Kadett/Manta one would work.