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rotorwrench · 03-08-2017, 11:56 AM

They were actually to aid in removal of the sand cores that were used to cast the block. Ford did away with them in the 1941 block change. That is also where they changed the area where the intake manifold deck surface is. Ford was tightening its belt in 1941. The war was already going on for the Canadians and most of the raw materials for cast iron were coming from Canada by then. They used a bit less cast iron in each engine with that change but with over 100K engines produced that year, it may have been a good bit of savings overall.

03-08-2017, 11:56 AM	#16
rotorwrench Senior Member Join Date: Jun 2010 Location: San Antonio, Texas Posts: 16,508	Re: What year is this V8 flathead engine? They were actually to aid in removal of the sand cores that were used to cast the block. Ford did away with them in the 1941 block change. That is also where they changed the area where the intake manifold deck surface is. Ford was tightening its belt in 1941. The war was already going on for the Canadians and most of the raw materials for cast iron were coming from Canada by then. They used a bit less cast iron in each engine with that change but with over 100K engines produced that year, it may have been a good bit of savings overall.