[FFR428]

I had a NOS SR block with no casting numbers and a partial date code. It had the ribs on the outside and triple webs on the mains and 4.13 bore. From what I understand Ford used the same casting molds toward the end of the FE production and the FE/ FT blocks were pretty much the same from Michigan Casting center. Just bored for the application called for. My block also did not have the telltale 428 inside the water jacket and had 352 on the upper left of the block and the casting was kind of rough. They ( MCC) also had some core shift issues with the worn molds towards the end of the FE production. I'd want to see the sonic numbers and overbore before anything as these could be a crap shoot. Good luck, G.