Among the FE's some of the 406's and all 427's had cross bolts. this is slightly different than 4 bolt mains since it has two bolts that go up into the block and two that come through the side skirts into the main caps which is not possible on the Lima (370/429/460) blocks or small blocks since they have no block skirt like the FE's
rat, some of the last 390s (73 to76) were cast with 3-webbed mains, they might have been made from FT molds. The lumps are there where the crossbolts go, but I've never seen a 390 with cross bolts unless the owner did it himself. Also, if an FE has crossbolts, you can see them from the outside above the oilpan rail. DF
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