The White cab-over-engine 700-Series and 800-Series motor truck models were introduced in 1934,and
were revised in 1937.Until 1938 most if not all of this range were powered by a White Pancake Flat Horizontally-Opposed 12-Cylinder Gasoline-Petrol Engine,which has been variously described by several different authors as being a ‘V12’,an ‘opposed piston engine’ and a ‘horizontally opposed piston engine’,but in actual fact it was a pancake flat horizontally-opposed 12-cylinder engine.It was originally developed to power White City 100-Passenger Motorcoaches,and was made in at least two sizes:465 CID-7.6 Litres and 505 CID-8.3 Litres.
At least one of the flat-12 engines was designated 24 - this was the power unit of Autocar and White
T17 pilot halftracks for the USA military in 1943.
VALKYRIE
[/quote]
Are you sure it was opposed which would mean 24 pistons with either one crankshaft linked by rods etc, or two crankshafts coupled with gears. Or was it simply a flat 12 with one crankshaft between two banks of six?