I have 3 of these 404632 number 5 aluminum thermostat housings for sale. These were used on all 1970 350/455 engines. They were natural on aluminum intake W30 and W31 motors and engine color on cast intakes. Hard to find in decent shape. The minor pitting will be hidden by the hoses. I will true them up on a horizontal sander before shipping. $75 each plus shipping. Al

Al, just wondering if you know what the “2” in the middle of the “5” means on the one you sold?

Hi Tom,
my understanding is it’s just a series of production. I’ve seen a 3 inside the 5 as well. Also the big 5 can be located on either side of the waterneck. Quite a few variations.

Thanks for the explanation Al