I have come across a block that is filled to about two inches from the deck with block filler. It is an old fill so it is the concrete looking fill instead of the more modern epoxy.

The block is.....and this hurts...a 1966 426 Hemi. Otherwise it is in great shape. No damage, standard bore and was running when it was pulled out. Lived life as a drag car only.

So, Hammer drill and masonry bits, muriatic acid or ??? Any hints, tricks, or old timers solutions appreciated.