340-4 340-6

[brotow]

Does any one know the significance of the numbers 340 4 or 340 6 on the side of a 340 block?   had 2 340 blocks one had 340 4 on the side of the block the other had 340 6. What does the 4 and 6 represent?  4 barrel, 6 barrel?  Also the 340 6 block has a blank vin area, (replacement block?).

[ChallengerHK]

If it's what I think it is, this designates the casting run number, so the first was the fourth set of castings produced from a mold, and the second was from the sixth set.

[dfrazz]

If it's what I think it is, this designates the casting run number, so the first was the fourth set of castings produced from a mold, and the second was from the sixth set.

   Molding cast number.  Nothing to do with 4 or 6 barrel.

[Cuda Cody]

Yes, as stated it's the casting number.  Every time they make a change or repair to the casting they change the number.  No VIN stamped is most likely an over the counter block.  If it's a warranty block it would have the rivet tag or at lest the hole.

Does any one know the significance of the numbers 340 4 or 340 6 on the side of a 340 block?   had 2 340 blocks one had 340 4 on the side of the block the other had 340 6. What does the 4 and 6 represent?  4 barrel, 6 barrel?  Also the 340 6 block has a blank vin area, (replacement block?).