Here are some numbers I managed to find for IH engines. Good Luck! Serial numbers IH Gas Engines
IHC type M engine, 1 ½ HP, 650 RPM, Kerosene A101- A1970 1917 A1970- A19492 1918 A19492- A42765 1919 A42765- A70745 1920 A70745- A82430 1921 A82430- A85631 1922 A85631- A91826 1923 A91826- A99317 1924 ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- -- McCormick-Deering LA engine 1 ½ - 2 ½ HP
LA101- LA133 1934 LA133- LA14655 1935 LA14655- LA17853 1936 LA17853- LA29505 1937 LA29505- LA41947 1938 LA41947- 1939 ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- -- McCormick-Deering LA engine 3 - 5 HP
LA501- LA133 1935 LA981- LA1725 1936 LAB1726- LAB4470 1936 LAB4471- LAB9029 1937 LAB9030- 1938 ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- -- McCormick-Deering LB engine 1 ½ - 2 ½ HP
62614- 66393 1941 66394- 72943 1942 72944- 76060 1943 76061- 86647 1944 86648- 100998 1945 100999- 114787 1946 114788- 130393 1947 130394- 148518 1948 ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- -- McCormick-Deering LB engine 3 - 5 ½ HP
22287- 25275 1941 25274- 30922 1942 30923- 33508 1943 33509- 40100 1944 40101- 48766 1945 48767- 56535 1946 56536- 63625 1947 63626- 72132 1948
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