The two most likely locations I can find for the engineering & experimental shops is first, the old Imperial Wheel plant which was taken over by Buick after Chevrolet and Monroe were finished there. When Buick took over in 1916 the plant had the combined numbers #18 #21 & #22 but would eventually become just #18. The photo at upper left (when you enlarge the photo above) shows a building with arched windows and slanted roof and points me in this direction, but I need further research. The other possible location would be the old Weston-Mott factory #31/#32/#33 because the photo at the lower left shows daylight streaming in from both directions. “I have since found out that (at least some of) the photos are from Weston-Mott”. The east and west wings would provide this only on the second floor. The only other Buick building’s with arched windows in Flint would be the original Kearsley st. plant but Chevrolet was using that structure in 1923 in cooperation with Mason Motors. And also the W.F.Stewart plant #3 located south-east behind Stewart #4. Also the original Buick factory #01 on the inside windows of the east and west wings (the part overlooking the single floor center section). As this photo is from at least 1920 they could have been using both #01 and the old Weston-Mott plant. I lean more towards the east wing of the Weston-Mott factory at this time. I’m thinking maybe both locations.
Here is #03/#30 during the winter. Division street is just beyond the gate. This view is facing north east.
The model of the factory shown in the top photo is at the Buick Research Gallery in Flint.
This bottom view (from Google Satellite) shows the skeletal remains of factory #30 in the center,this view is facing directly south with the foundry, factory #70 beyond. Factory #30 became factory #03/bldg #30 after the old drop forge #03 was demolished in 1963, and supplied coil springs for the assembly plant since 1936 when the Armstrong spring plant finally closed. The building in the foreground is all that was saved from this factory to become the Cultural and Diversity Center for the G.M.Powertrain north site.
This view shows the camp for the black workers just to the south of the foundry. The workers from here were placed on the very hot jobs pouring metal and all other dirty work from the beginning of foundry operations to the end of operations in 1980. During the 70’s longhairs or “Hippies” were treated as the new blacks at Buick.
What you see here is the south end chipping and grinding department, which was obviously “WHITES ONLY”.
This view is facing west with factory #05 in the background.
This view is facing north east across Division st looking at the skeletal remains of the foundry. In the distance beyond the plant can be seen the Flint City water tower. The south end was the chipping and grinding department where you see the cement pillars.