So after 235 installation it was running a little warmer than I prefer. I was running 180 thermostat. Could not find a 170 at the parts store only 160. Didn't want that either. So after some research found a 170 for a mid 90s small block but had a extra piece on the bottom. Tried it and I believe when it opened it got wedged down because it was getting hotter than before. So I cut it off and reinstalled. Couldn't be happier. In traffic it climbs just a fuzz over 180. Perfect and availability is better because the flaps keep them in stock. Just an FYI for anyone that wants to run a little cooler. Picture shows what I did .