from the May 1995 RootesReview
“Slow the coolant through the engine and expect the efficiency to improve” … So is the theory. Previous tech tips from other Clubs outline what can be done to water pumps to achieve the desired result. My tip comes from the Graham Bros. Rad shop in Toronto that I recently put into practice. The result? A 10 to 20 degree cooler running engine. (Car has a new high density rad core and non-electric temperature gauge for reasonably accurate readings). This may be of interest to those marginal, “sweat in traffic” Tigers.
Insert the restrictor in the top rad hose as close to the thermostat housing as possible. The tight fit and first hole bend prevents movement of the insert. Any rad shop has short header tank nipples and can easily solder the bits together.