Casting Numbers on a Model J Block?

  • alsancle
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15 Jun 2011 00:56 #20297 by alsancle
alsancle created the topic: Casting Numbers on a Model J Block?
I know the J number is on the bell housing, but what is this number found cast in the right side under the water jacket cover?

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  • Chris Summers
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15 Jun 2011 12:37 #20300 by Chris Summers
Chris Summers replied the topic:
From p. 48 of my reprint of the Model J parts list. I don't know if AA signifies anything different but this was the only J100 I could find. Anyone with a solid answer is welcomed to join in and offer a correction or further explanation - remember, I'm not a technical guy in any way, shape or form.

(pardon the size but I wanted to make sure everyone could read it)


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15 Jun 2011 13:04 #20301 by Chris Summers
Chris Summers replied the topic:
Greg Frownfelter pointed out that the numbers are similar to the casting number on the '35-'36 Auburn head. Maybe an internal number from Lycoming?

I expect that Randy will provide the real answer soon.

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15 Jun 2011 16:27 #20304 by alsancle
alsancle replied the topic:
I was wondering if all blocks had this number cast? Unfortunately the other block I have access to is off at the machine shop so I didn't have another to compare.

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16 Jun 2011 13:26 #20310 by alsancle
alsancle replied the topic:

alsancle wrote: I was wondering if all blocks had this number cast? Unfortunately the other block I have access to is off at the machine shop so I didn't have another to compare.


Well, I've got a picture of at least one other block with the exact same casting so I'm guessing it present on all the other blocks too.

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  • Bob Roller
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17 Jun 2011 19:27 #20316 by Bob Roller
Bob Roller replied the topic: Block numbers?
I would say it's a mould number if it appears on all the "J"blocks. If it is,it would be an "in house"designator for the "J"blocks only.
Lycoming did cast other large blocks for trucks that had identical CID of 420 when finished.

Bob Roller

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