While we are all looking at our Aluminum SL6 blocks, check to see if any of them have the 12 undrilled oil passage "bosses", intended to feed hydrualic lifters.
This photo shows a block that has the bosses, the small white arrow points to the bottom of one boss. This is block number 46,944
Twiggy's block (46,944) and the block in my 65 Dart Convert. (33,307) do not have these bosses.
As the story goes, the die cast Aluminum SL6 block was originally designed to have hydrualic lifters but the idea was dropped after the first castings were made. I remember seeing something that said that the "dies were changed to eliminate the bosses" but does that mean that a new set of dies (molds) were made or were the original ones altered?
I have never seen any info. on how many blocks were made with the extra bosses and the block numbers having this feature, seem to range all over the place, so it would be interesting to know the number of any block that has these undrilled oil passages.
DD
