You can put a 4" stroke 1949 and newer Merc crank pistons and rods in the 1948 and older 24 bolt blocks but you have to use the older timing gears and camshaft to keep the crab type distributor on the front of the block. The motor will end up looking exactly like the older motor but will be a 130 hp 255 ci motor.
On the prairies the 255 Merc engines are fairly common since farmers usually replaced the worn out motor in their trucks with a rebuilt Merc engine. I have several of 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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