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| − | ===1938-1942===
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| − | [[File:1938-'48_59A_FORD_BLOCK_BELLHOUSING_DETAIL.jpg|thumb|left|350px|1938-’48 Ford 59A]]<br style="clear: both" />
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| − | *24 studs hold on the heads.
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| − | *Two water pumps on the front of the block.
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| − | *Water necks on the heads located in the center.
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| − | *Distributor is front-mounted and still driven off the cam, coil mounts on distributor with 2 screws side by side, 37-41, 42 coil mounts on bracket top of passenger side head, "crab"-style distributor cap and conventional rotor.
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| − | *Marked 78, 77, 81A, 81T, 41T, 99T, or 21A on heads.
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| − | *Full floating bearings.
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| − | *Bell housing is cast in as part of the block.
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| − | *Ford engines had 221 cubic inch displacement.
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| − | *Mercury engines had 239 cubic inch displacement.
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| − | *Ford engines retain the same bore and stroke.
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| − | *Mercury engines receive a 3.1875" x 3.750" bore and stroke.
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| − | ===1946-1948===
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| − | [[Image:Engine.JPG|border|400px]]
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| − | *24 studs hold on the heads.
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| − | *Water pumps and neck retain the same location as above.
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| − | *Distributor mounts on front cover at camshaft, new 2 piece-distributor cap.
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| − | *Heads are marked 59A, or 59AB.
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| − | *Both Ford and Mercury engines have a 239 cubic inch displacement.
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| − | *Bell housing is cast in as part of the block.
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| − | *Ford and Mercury engines share bore and stroke 3.1875" x 3.750".
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| − | ===1949-1953===
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| − | {|
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| − | |[[Image:53_Ford_4_dr_4.jpg|thumb|center|420px|1953 Ford flathead engine]]
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| − | |[[Image:1950fordflathead.jpg|thumb|380px|center|1950 Ford flathead engine]]
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| − | |}
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| − | The new engine was actually introduced in '48 when new truck line is introduced, car use began in '49. Major changes are made to the flathead:
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| − | *Water passages are enlarged for improved cooling.
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| − | *Water necks are now thermostat housings and bolt onto front of the heads.
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| − | *Water pumps remain in the same location.
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| − | *Heads are held on with 24 bolts rather than studs and nuts.
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| − | *New conventional style distributor is used.
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| − | *Distributor is now driven by a gear off the cam.
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| − | *Bell housing is now a bolt-on stamped steel piece for cars, cast iron for trucks.
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| − | *Modern insert bearings are used.
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| − | *Ford engines marked 8BA, EAB or 8RT on the heads.
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| − | *Mercury engines are marked 8CM, or EAC, on the heads.
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| − | *Ford engines remain 239 cubic inch displacement.
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| − | *Mercury engines are increased to 255 cubic inch displacement.
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| − | *Ford retains the 3.1875" x 3.750" bore and stroke.
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| − | *Mercury receives a 3.1875" x 4.000" bore and stroke.
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| − | ===1937-1940 V8 60 flathead===
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| − | *17 bolts hold on the heads.
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| − | *Much smaller than the normal flathead V8.
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| − | *Has full floating bearings.
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| − | *2.60" x 3.20" bore and stroke.
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| − | *136 total cubic inch displacement.
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| − | *1937 engines have tin sided blocks, while '38-'40 are full cast blocks.
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| − | *Distributor is the same as the '37-'41 full size flatheads.
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| − | *Two water pumps screw into front engine cover.
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| − | *Oil pump is built into front main bearing housing.
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