V-1710F from P-38 with P-40K, M, and N style of distributor (mounted at the back of each valve cover). Distributor used on the P-40K (V-1710-73), P-40M (V-1710-81),
and P-40N (V-1710-81, -99, and finally the V-1710-115). F series always had the reduction gear shown here. From Allison O&M manual for V-1710F series.
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