Hey folks I have been skimming through but haven't found the information yet. Was going to replace my thermostats on my 67 401 magnum but low and behold i pulled the cover and both holes empty lol. I know they should be 180 degree thermostats but cant find a part number for them or the gasket. Any help would be greatly appreciated from service book (no numbers of course) from 351 to 478 thermostat should be the same.
Thanks in advance

Last edited by Bamafan0001; 07/09/2023 9:25 PM.

1967 GMC 7500
See more in the Big Bolts Bay
Keep 'em shiny side up!