Craig - The "850" head is actually a 1956-62 "261" head according to my casting code info. The details about the '57 261's head can be found in the 1957 Chevrolet Truck Data PDF.


~ 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)