A new purpose-built plant was constructed at their works in Tyseley, Birmingham.
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These materials were so crucial to aircraft production that with the outbreak of World War II a shadow factory was established in the remote area of Cumberland (now Cumbria), at Distington, near Whitehaven.
The 3.7 L (3670 cc/223 in³) engine, designed by Tadek Marek, was a double overhead cam straight-6, with cylinder head and block of cast R.R.50 aluminium alloy.