P-40E V-1710-39. P-40K,M, and N will be nearly the same, the most noticeable difference being the style of distributor (mounted at the back of each valve cover). See later photos of
P-38 engines for the later style of 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). From Allison O&M manual for V-1710F series.
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