If you get one of the 255 cubic inch Merc engines you can put the crank and pistons in one of the old style blocks with the centre outlet rad hoses. It's best if you get a .030 overbore Merc and a smaller bore 239 and bore the 239 to .030 over. Use the old camshaft and the old style front end and distributer and you've got a 125 hp flattie. Some people just try using the old style heads on the Merc engine but that won't work. The engines are designed for different water flow routes and you end up with bad heating problems. We all know you don't want to impede cooling on a flattie.
The cracks in the block from the bolt holes to the water passages won't cause any problems. It's the cracks that are down in the port and valve seat area that cause all the trouble. Ford relieved the block on their factory rebuilds in the 50s and 60s and this was supposed to cure the cracking problem.
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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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