As I have noted before regarding boat pits in general, this practice was seemingly abandoned after the 2nd Dynasty in which for reasons unknown, if they are even related, Djedefre revived the practice. A reference of G1's boat pits:
The evidence strongly suggests Djedefre was responsible for the southern boat pits. Given the unreasonably close proximity of the causeway boat pit to the causeway, i.e. it respects and was built after the causeway, it stands to reason it too was made sometime in Djedfre's reign or later. The eastern boat pits are outside the main temenos wall which all things considered I would assume these too were made In Djedfre's reign or later. Eastern/causeway boat pit perspective:
We also note in the pictures above that one of the queen's pyramids has a boat pit as does the satellite pyramid (G1-d), which the latter seems to be just as indiscriminately placed as the satellite pyramid itself. Interesting that no one has a clue what the satellite pyramid was for and seems all told quite out of place as if it were inserted after the fact.
Also to consider as noted before is Khufu's boat itself which the interior displays in wood a style of column not found until the 5th Dynasty:
Though no one really knows for sure, these boats are equated to the later Aten ("solar barque") which the pharaoh/RE is to ride east to west across the vault of the sky along the path of the sun. The rub, however, is that G1 has 5 boat pits, none on the west side (or north), Khafre has 5(6?) boat pits to the sides of the mortuary temple (none around the pyramid like G1), all on either the south or north-none east or west, and yet despite the fact 2 of the roofs were found almost entirely intact there were no boats.
It seems in reality there was no rhyme or reason to the orientation of the boat pits nor does it make much sense why a pharaoh would need 5 boats in which poor Menkaure had none.
At any rate, it is interesting to think, as the story goes, that there was perhaps as much as a 22yr gap (or more) between the end of Khufu's reign, i.e. working on G1, and the resumption of pyramid building with Khafre. All told it definitely appears the boat pits of G1 at least were added more than a decade, perhaps more than two decades, after Khufu had died and supposedly construction of G1 completed. It was also at this time, or later, a second temenos wall was built right over the top of the southern boat pits. Given the abundant graffiti found on the underside of the roofing blocks of G1's southern boat pits, with many cartouches of Djedefre, it seems curious for there to be none found on the underside of the two largely intact roofs of G2. Wouldn't that be a hoot if there too Djedfre's name was found....
For more along this line of thinking HERE.