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Check the damper to see if it's a 6-pak crank.
Not that it actually verifies the BLOCK, per se....

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(IF) it's from a 70/71 Six pack, then it will have a different harmonic balancer - take picture of it or see if you can find numbers on it.


Check pad on top of block to make sure its a 440 HP Block (get all numbers on top of this pad: D440...e440...F440...etc...)

Check Vin number stamp on pad (side of block).

Check casting dates on the side of the block as well.

All of things will (help) ensure it's a real 6-pack engine, but the only way for sure is if the VIN matches a 6-pack car.

Don't be tooooo discouraged if it's not a real 6-pack engine. It still might be a good 440 HP engine and worth buying (if the price is right).

Good luck

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I thought the only way to tell for sure, was to confirm that the stamped VIN on the engine matches a known 440-6 pak car.

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Check the damper to see if it's a 6-pak crank.
Not that it actually verifies the BLOCK, per se....

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(IF) it's from a 70/71 Six pack, then it will have a different harmonic balancer - take picture of it or see if you can find numbers on it.

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UNLESS IT HAD THE SAME VIN AS MY 70 CHallenger
In which case I would gladly double his investment.

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Well yes, if it happened to match my 70 Superbee I might pay a little extra for it as well.

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Unless the pad on top of the engine pad indicated it was a (69) or more specifically a 69 1/2 six Pack engine which was internally balanced.

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