So... after looking at several charts throughout the inter webs I still can’t seem to definitively identify these.
THis info copy and pasted from another HAMB thread... General Information The integral cast-in bell housing continued all the way through 1948 (except for the Ford trucks, which received in 1948 the newer '49-53 style engine with separate bell housing). All engines during this period had front, block-mounted water pumps (with wide belt pulleys), and twenty-four stud heads with center-located water hose outlets. Original cylinder heads for 1938 to 1942 were generally marked with "81A" for Ford or Mercury engines thru 1941; "81T" for truck engines from 1938 to 1942; "41T" heads were sold for 85/90hp trucks built from 1938 to 1942; "99T" for 100hp Ford Truck and Mercury in 1939 to 1941; and "29A" for Mercury in 1942. Heads marked "59-A" or "59AB" were used on all 90/100 hp (Ford & Mercury) engines from 1946 through 1948. The 59AB heads were sometimes used on earlier blocks in replacement rebuilds. You can find the Ford part numbers (basic 6049 and 6050 number with prefixes and suffixes) in the face of the heads and sometimes on the side edge of the head next to the intake manifold. The postwar cylinder blocks were also marked "59" (or "59A" or "59L" or "59X" or "59Y" or "59Z") with raised letters cast into the top of the bell housing part of the block. The Canadian version had a "C59" cast into the same area. Another block assembly (the "41A" style) was used to replace the "81A" style cylinder blocks, which were all the 85/90hp engines with 3.0625" bore. The 1938 to 1940 blocks had four small "freeze plugs" (2 each side) in the oil pan mounting surface. The 1941 (except for a short carryover) and later blocks did not have the freeze plugs. These can be noted from outside an assembled engine by the slight "bumps" in the side of the block casting, right at the oil pan mounting surface. In mid 1938 Ford modified the engine for larger diameter main bearings. For complete crankshaft bearing specs CLICK HERE. The original engines from mid 1941 to final 1942 production (when WWII ended auto production) had a raised intake manifold deck surface. Prior to these engines, the entire manifold deck surface was machined flat, right out to the edge of the cylinder deck. The postwar engines seem to have returned to the practice of machining the intake deck all flat again. The foundry would also place what were probably "lot" or "production" numbers in the castings on all blocks. These were usually a small group of letters and numbers cast on the top of the bell housing....right next to the vertical surface of the back of the block. Unfortunately, any records of these numbers are long gone and they provide no clues as to the particulars of any engines. Water jacket holes in the top of the cylinder area of the block will tell you what years the block may be: 1938 Blocks: Large triangular shaped holes between the center cylinder bores 1939-42 Blocks: Three openings between the center cylinder bores: top one is triangular; center and bottom holes are trapazoidal (or keystone) shaped. 1945-48 Blocks: The three center openings: top one is triangular; center and bottom holes are large round holes. All 24 stud engines using cast iron heads were equipped with dome-top pistons (in either aluminum or steel). Engines built through 1939 had a pressed-on timing gear on the camshaft. Beginning in 1940 this gear was bolted on to the camshaft. All engines up through 1948 had "mushroom" style valve stem ends and split valve guides. Some engines (including 59A style) had removable hardened valve seat inserts. It's not uncommon for an early (pre 1946) engine to have the valve seats installed by an engine rebuilder at some point in its life. As for original paint colors, the Ford and Mercury engines through 1940 were a dark green. Ford cars continued the color until 1942. Mercury engine had a dark blue color from 1941 thru 1948. Postwar Ford engines were dark blue thru 1948. Ford truck engines were generally the same as Ford cars during the years of this group.
Both of those blocks are wartime or postwar blocks. Pay no attention to any paint on them, as that could have been changed ten times already. It is generally thought that any block with a 59 on it was built during or after 1945.
59 on the bell indicates a 1945 thru 1948 Ford or Mercury engine. 239 cu in. The other numbers mean nothing to us.
Lots of speculation has been made about the other numbers on the bellhousing, but no info has ever been found from the factory about what they mean. Many people have searched and researched Ford records for clues to the other numbers on flatheads, but there is nothing remaining to say decipher the code.
I have never found any documentation for the extra numbers and letters on some blocks. I suspect that these are post-1948 castings...LOTS of 59's were made after new car use ended, as the postwar demand for parts from henry type Fords lasted a long time. I think a fair number of complete or short engines were made after '48, too. These seem to have gotten the cheaper cranks, rods, and valve stuff from the 8BA types. Ford had no problem churning out extra 59's as everything could be run off the same basic tooling. The 5 in 59 is taken from the intro year...1945.
The Jalopy Journal
