The last flatheads with the water pumps in the heads (21 studs) were produced in 1937. Then they came out with the 221 cube version (24 studs) with the pumps in the block and made it until 1942. The Mercury engine (239 cubes) was introduced in 1939 and by 1943 the 221 was dropped. Of course this doesn't mean that the military couldn't have used the 21 stud in the Scout.
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1940 Cab 11 C8 Wireless with 1A2 box & 11 set
1940 Cab 11 C8 cab and chassis
1940 Cab 11 C15 with 2A1 & Motley mount & Lewis gun
1940 Cab 11 F15A w/ Chev rear ends
1941 Cab 12 F15A
1942-44 Cab 13 F15A x 5
1942 cab 13 F15A with 2B1 box
1943 cab 13 F15A with 2H1 box
1943 Cab 13 C8A HUP
1944 Cab 13 C15A with 2C1 box
1943 Cletrac M2 High Speed Tractor
MkII Bren gun carrier chassis x 2
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