You might try reading up in the 1955.2 Series Shop manual starting here on how to set them for initial alignment and then check your sweep pattern. Your 1956 possibly has a later electric motor which is covered in greater detail in the 1956 Truck Shop Manual Supplement. Others will probably chime in soon with their experience and knowledge. wink


~ 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)