Ber 2, Master cylinder access is the larger diameter hole on the left side of the transmission cover opening. His picture is looking up from underneath. He is asking abut the smaller hole in his picture to the right of the transmission cover opening before you get to the battery box cover. My 1951 3100 original cab floor does not have that hole either. smile


~ 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)