The OP's pic does not show the factory partial VIN stamping that should be present. Those numbers were added at some point after production. Scott's pic shows where the factory stamped them in '70.
Typically NO dates on the HEMI top pad for 1970. Just the "WT" which this one got twice. 
.jpg "8011549-Scott1970HemiPad(2).jpg")
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Here's a 68 pad, block was cast in 1966
suspicious.
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The machine marks suspicious.
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But as far as the date on the pan rail extension, you might be right Dan, but I've seen some earlier blocks (originals installed in cars) with similar dates, so I can't comment with certainty on that one.
This tag was on a block installed into a 66 Hemi car, it was said to have been purchased as a replacement from Kieth Black back then. I can't say for sure but it appears that it was painted at the factory, either that or someone took the time to mask off the tag before painting and installing the engine.
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I agree on the not painted part.
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I have been reading this thread as well as this one: 70 440 Warranty Block
I have this 1970 Hemi block with no VIN stamping. It does have the WT on the front pad. I can find no evidence of a hole in the side of the block for a rivet retaining a metal tag. As you can see from the back of the engine, there appears to be some of the correct Hemi Orange paint remaining. The rest of the orange paint seems to have been painted later and with the incorrect color.
I don't know if these pictures add anything to this thread but they may provide a bit more information regarding OTC and warranty replacement blocks. From looking at the pictures, does anyone have anything that they could share regarding this block?
Thanks.
Stan
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Does yours have a "B" stamped on the front pad?
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Mind your Ps and Qs. If I can remember correctly a block bore size can be 70th over stock in Super Stock. Can not remember the crank but it is something like 3.85. Wish I had an old NHRA book to study again. Going only by my memory and it is getting older and older, and I will type this like a question. Did Chrysler not put different letters on the side of the blocks to signify what piston went into each bore when assembling a Hemi at the factory. I thought I remember BCDEF piston sizes. So the Ps and Qs would be for another type of Chrysler description of a bore size of a Hemi Block.
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As most have seen, this is how most (if not all) replacements looked, I just wonder if there were other ways they were delivered.
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As most have seen, this is how most (if not all) replacements looked, I just wonder if there were other ways they were delivered.
I bought a bare MP Hemi block ('74 casting) from an individual in 1989. It was in a cardboard box with the Mopar parts tag on it.
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As most have seen, this is how most (if not all) replacements looked, I just wonder if there were other ways they were delivered.
I bought a bare MP Hemi block ('74 casting) from an individual in 1989. It was in a cardboard box with the Mopar parts tag on it.
I believe 1974 casting date block are the High Nickel content blocks sold by Chrysler through Direct Connection. Around 1978 Mancini Racing sold a bunch of old NOS Hemi Shorts Blocks but they were all gone by the time the Car magazine can to your house. Chrysler started to dump off all the Hemi Stuff. Do you still have the block, if so did you ever weight it.