LA 340 block crack in deck
My take on what you have is being that you have a 6 22 67 block, a portion of the casting mold program was carried over from the "poly" design. On a poly, that is a open water passage. This being so early, the hole was machined round and a plug pressed in. By 1968 this knob of deck surface had the hole not cast and then eventually not exist at all. This section is still a crack prone area BUT differently. Below 1970 block.
My take on what you have is being that you have a 6 22 67 block, a portion of the casting mold program was carried over from the "poly" design. On a poly, that is a open water passage. This being so early, the hole was machined round and a plug pressed in. By 1968 this knob of deck surface had the hole not cast and then eventually not exist at all. This section is still a crack prone area BUT differently. Below 1970 block.
