Later 261s had a by-pass hose from a port on the water pump (above the heater hose port) to a nipple on the thermostat outlet housing.


BC
1960 Chevy C10 driver 261 T5 4.10 dana 44 power loc
1949 GMC 250 project in waiting
1960 C60 pasture art
Retired GM dealer tech. 1980 - 2022