Tim,

Does the internal cup on the 261 t-stat slide down to cover the slots when it opens to the radiator? You might check it in a pan of hot water...

Slots are open to circulate coolant to prevent hot spots and then close to allow full flow to radiator...my guess.

Mike B smile


Mike Boteler

1956 Chevy 3100 Resto Rod
1952 Willys M38 Army Jeep
1983 Jeep CJ7 Laredo
1984 Jeep CJ7
+++++
Silver Spring, MD