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7506018004 from books.google.com
... 750 60 1800 4 11 11 Radial 1100 4.125x4.5 100 1800 7 11 Line Radial 5.4 180 6.0 Chevron 4.375x5.000 100 5 11 376 Cleveland Four 2.500x3.062 25 1700 4 11 Line 33.0 280 26 " long . 61 Motorcycle en- gine modified . Comet ( Aircraft 4.500 ...