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We still use imperial for the same reason everyone still used a qwerty typewriter.
My 1986 El Camino was assembled in Mexico. The engine and ancillary parts are SAE. The rest of the car is metric. The transmission (2004R) has a huge METRIC stamped into the pan.
The strange thing is the entire world uses tire & wheel diameters in inches.
The bolts that hold seat belts are mandated to be a certain SAE size and thread pitch.
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Glen
49 Year member of the Porsche Club of America
1985 911 Carrera; 2017 Macan
1986 El Camino with Fuel Injected 350 Crate Engine
My Motto: I will never be too old to have a happy childhood!
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