Casting number question

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Bobbycz

Bobbycz

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block casting number is 2780930-340-6 then I have another one that has a number 2780930-340-3.
What does the 6 and 3 designate?

Cylinder head casting number is 2531894-A and the other set has casting number 2531894-E.

What does the A and E designate?

Thanks
 
Really it doesn't mean anything….

My understanding is the -x (x being whatever) is the casting revision… Nothing is really different…. But molds need to be changed out over time and so on….
 
In the current world of Mopar casting/part numbers the superceded parts get alpha characters added to the end of the part number rather than the old way of changing the whole number. I was just wondering if something changed with the heads. So thanks for the reply what you are saying makes sense.
 
The dash *, numeric or alpha, are basically the same thing. Represent core revisions.

My favorite is the 2780930-340-6 being represented as a T/A block. I love that one!.
 
What are the casting dates of the two blocks? It has been my experience that the higher the last number is, the newer the block.
 
I gotta run out right now but I will try to look tomorrow. Dates codes indicated the -3 is 67 and -6 is a 69 if that helps.
 
The 6 and the 3 are the batch numbers. There could be anywhere from a 1 to an 8 there, it has no correspondence to the year or date or the number of cylinders or carbs or anything else those T/A heads want to tell you. Simply a change in the batch number when the blocks were cast. Geof
 
Thank you for the reply. It sure seems to be the case as the date codes appear to be all over the place.
 
I've heard many different responses to the dash number. One being it was a revision so therefore up a dash number, another was repairs (shifted...)Having made molds myself for the automotive industry, in the past.

The molds were numbered by cavity numbers, as they are typically more then one mold. This was done for traceability, incase they're would be an issue with a specific mold then it could be addressed.

That's my take on this.
 
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