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Which Year of the block

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Which Year of the block

Post #1 by Ford1946 » Tue Sep 15, 2020 2:53 pm

Hello. When I'm checking my blocks then there is some different numbers. All of them has a 240 crank. The numbers are:
C6AE - 6015 - D and a small 6E4
D2AE - 6015 -AA and a small IJ30
C6AE - 6015 - D and a small 6K13
The first one is from a Galaxie 1965
The second one is from a truck. Do not know year or model
The last one is from a van about 1968 - 1972
Is one casting better than the other? or is it just casting numbers?

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Re: Which Year of the block

Post #2 by sdiesel » Tue Sep 15, 2020 4:04 pm

The C denotes the sixth decade, the D denotes the seventh decade of last century

All blocks are similar until EFI blocks
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Re: Which Year of the block

Post #3 by bubba22349 » Tue Sep 15, 2020 7:11 pm

X2 yes you can learn a lot from the Design Numbers, those design numbers will decode as fallows
C6AE-6015-D 6E4
C = The Decade part was made in this case 1960
A = This is the car line the part was designed for i.e. In this case it was for the big Ford Cars like the Custom, Galxie etc. because of this it makes it a 240 Cu. In. Six Block.
E = Engine is the Enginering Department responsible for designing the part
6015 = Fords generic part number for a cylinder block
D = This denotes that the part was revised or improved from orginal design (of an A) three more times. Often times these these revised designs are a very minor change such as when the emissions parts changed from one year to the next might be as simple as adding an extra external mounting boss or a different passage or mod in the block.

6E4 = This is the blocks Date Code and is the exact Date that this 240 Block was cast at the Ford Engine Foundry. Using the above design / casting number C for the decade of 1960 we get 1960 the first number in the above date code is the year add this to decade and we get 1966. E = the month of May, and the 4 is the day so block was cast on May 4th 1966 this engine was originally used in a late production 1966 model year Car, Van, or Pick Up Truck, so if it was in a 1965 Galaxie then it was a replacement engine if the car was a 1966 though it might of been original to the car. As a side note I worked on the Ford assembly line in Pico Revera, Calif. we built the Big Ford (Customs Galaxies', LTD's) cars and also the Thunderbird's there. I remember that we would shut down the plant at the end of June for two weeks while they retooled the line for the next years Ford models.

C6AE-6015-D 6K13 this 240 engine block design number is exactly the same as your first block, (see the above info) so the only difference between them is the day the block was cast. 6K13 decodes as October 13th 1966 this date means this engine was originally made for an early production 1967 year model Car, Van, or Pick Up Truck. If this engine was in a 1968 to 72 Van then it was a replacement engine, however if the Van happened to be a 1967 year model then it could of been its original engine.

D2AE-6015-AA 1J30 From these design numbers and letters as with above the block info is mostly going to be the same with these exceptions. This 240 engine block is your newest one and it was cast on October 30th, 1972. If we assume that it was the orginal engine out of that Pick Up truck then it would have orginally used in a 1973 Ford year model. Yes X2 essentially all the 240 or 300 carb engine blocks will diamentualy measure the same from years 1965 to 1986 and some parts can be interchanged such as a compleate 240 rotating assembly for a 300 rotating assembly. Hope that helps you, good luck :thumbup: :nod: Edited
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Re: Which Year of the block

Post #4 by Ford1946 » Wed Sep 16, 2020 3:16 pm

Thanks for your help. I will use the oldest of the blocks as it is in the best condition.

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Re: Which Year of the block

Post #5 by Fordman75 » Mon Sep 21, 2020 8:54 pm

You might want to check with FTF but I'm pretty sure the 65 & 66 blocks had a different main thrust bearing then the later engines did.

I can't remember for sure. But it may just be on the 65/66 300's and not the 240's. Greg ( The Frenchtown Flyer ) should be able to confirm if this is true or not.

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Re: Which Year of the block

Post #6 by THE FRENCHTOWN FLYER » Tue Sep 22, 2020 8:52 pm

The early blocks did indeed have a smaller thrust bearing. 1965 and '66 (not sure on '66 - it may have been a mid model running change to the larger size). Later thrust bearings will not fit the early blocks.

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Re: Which Year of the block

Post #7 by pmuller9 » Tue Sep 22, 2020 8:57 pm

Measure the old thrust bearing flange if it is still in the block.

The early bearing has a 3.567" OD flange and the later is a 3.602" OD bearing flange.

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