[markjohnson]

I love those thermostat housings also and like to use them. Keep in mind that L88’s also used a spacer underneath them. I think this was for clearance for the upper radiator hose on Corvette short water pump applications with left side alternators. Here’s mine in an off-topic car with a me-fabricated spacer that’s a little thicker than a factory spacer because I added a temperature gauge NPT port in the back side of it. These particular T-stat housings were always cast iron but I actually bought an aluminum version from Rockauto, believe it or not! It’s on a shelf around somewhere because it’s not exactly the nicest casting but it is interesting. If I can find it later I’ll post a photo.