Here are the torque specs listed in the 1948-51 w/52 Supplement Truck Shop Manual (1st pic below) and the 1949-53 w/54 Supplement Car Shop Manual (2nd pic below) covering your '54 235 manifolds.
~ Dan 1951 Chevy 3 window 3100 Follow this story in the DITY Gallery "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)
