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Hemi heads will bolt onto a 440 block except for the bolts along the lifter valley. The Hemi intake ports sit right over those holes so they moved the holes into the valley an extra 1/2 or so to allow the bolts to be accessed from underneath. In effect the 4 bolts (studs) in the lifter valley go up into the bottom of the head while all the others go down through the head into the block,these studs are threaded into the intake ports and need sealer on them.

Also the lifter valley had a deeper groove cut into it to allow the intake pushrods to miss the block since they were at a different angle. There are separate holes thru the deck for the exhaust pushrods.

Lastly the corners of the Hemi heads had drain tubes to let the oil drain back into the oil pan. The 440blocks have no provision at all for the drain tubes.

The other differences are the 4 bolt mains and the original hemi has no mounting ears for motor mounts. They use flush mounted motor mounts. Some current production blocks have both.

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