Re: Thermostat housing for 327/210 hp
Thanks for the reply Jon. I found the same results on my initial search plus confirmation at the GM parts site.
I went out to the garage and decided to remove the oil fill tube to see if it was the wrong one or find some other reason. The engine is back in a corner and in poor lighting.
The oil fill tube was tight, so I took a rubber hammer and tapped around it to remove it. Upon getting it off, I found it was bent and thus the interference with the thermostat housing. Even though it was bent at the base, it still is straight and tight when reinstalled.
Rather embarrassing to admit I didn't pursue it further before writing this thread.