Quote:
Originally Posted by rotorwrench
The blocks went through a subtle change for 1941. I would be more interested in results of thickness checks on 239 blocks produced between 1939 and just prior to the 1941 changes. Ford was conserving iron by those changes that eliminated the sand removal bores and the change to the manifold deck portion of the castings.
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My 42 block is a 239 military keystone block (round center water hole), has the raised intake surface and no sand removal plugs on the pan rails. It also passes the "pencil test" above the timing cover. As with most WWII military blocks, it is also factory relieved. I believe it to be the last iteration of the 239 block - before the war stopped production . . . followed by the 59x series.
BlockPrep4 copy.jpg
BrockPrep3 copy.jpg
PanRail copy.jpg
DeckComplete copy.jpg