No 216 was ever painted blue from the factory.
The 235s that were painted blue were the high-pressure car 235s that were first introduced in 1953, the "Blue Flame Six" car 235s.
No high-pressure 235 truck engines were painted blue.
There are conflicting opinions regarding the earlier low pressure gray-blue color (216s and early 235s) being carried over onto the high-pressure 235 engines in 1954 (some think the truck engine color changed to a lighter gray with no blue in it).
No one, including VCCA judges, have any documentation regarding the gray or blue-gray engine colors/formulas.
