The Flowkooler/Robert Shaw thermostats that have the soldered ring to fit the older housings may be the reason some of us have had a problem with leaking housings.
Look closely at the picture between the old stat on the right vs the new on the left. The outside of the center ring is almost 1/8" larger than the one on the right. It doesn't want to settle into the housing. So, looks like I am buying another Flashpower housing. Previously, I had gotten away with this with a Real Gasket silicone gasket, but hadn't noticed this until now. My Flowkooler water pump on the '69 blew the Real Gasket out. The '72 is a stock pump, but I am going to get another housing anyway.
Just throwing this out there.
Look closely at the picture between the old stat on the right vs the new on the left. The outside of the center ring is almost 1/8" larger than the one on the right. It doesn't want to settle into the housing. So, looks like I am buying another Flashpower housing. Previously, I had gotten away with this with a Real Gasket silicone gasket, but hadn't noticed this until now. My Flowkooler water pump on the '69 blew the Real Gasket out. The '72 is a stock pump, but I am going to get another housing anyway.
Just throwing this out there.