For the "best" forties flattie with all stock parts start with a 46 to 48 Canadian truck engine. They had higher compression and a better camshaft for operating at our higher altitude. Then get a 49 or up 255 Merc engine and put the crank and pistons in the truck engine. You need to change to the 239 crank gear so it'll work with the 48 camshaft since the gears are cut the opposite way. Bolt all the older accessories on and you'll have a 140 hp flattie that looks and sounds original. Oh, and Ford didn't use a 12 volt system until 1956 so flatties wouldn't have got them.
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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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