I did some checking in your Project Journal. Is the head in question the "8385913" one you have posted pics of previously? If so it should have the smaller temp sensor port which is 3/8" NPT (National Pipe Thread). A brass one from a FLAPS should fill the need. Others will chime in and confirm or correct my info.


~ Dan
1951 Chevy 3 window 3100
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"My Grandpa Carl's Truck and How it Became Mine"
1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver)
US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)