8n Thermostat

The location of the thermostat (in the upper radiator hose) makes me think that unless the block gets pretty hot, it won't open. A better design came along with the Jubilees, where it is located on the block, and would warm up along with the engine. Has anyone had this problem before, and do I dare attempt to put another stat in the hose????? ?????

Drilling one or two bypass holes in the thermostat will circulate water past the thermostat when it is closed, allowing it to constantly sense the engines temp. This will cause the engine to warm up a little slower. But on the other hand, the engine doesn't have to get so hot before the thermostat finds out about it. I haven't done this on one of these engines, so I can't give you the magic hole size. Start with a couple of 1/8' holes & go from there. At the other extreme, 2 1/4" holes are as much or more than you're likely to need. Good luck...Al English

Later engines with the t-stat in the head benefited from plenty of water movement because of the bypass nearby.