Reply to "Ford 400 FMX Block - D1AE-6015-A2C - All original"

In spite of 400 FMX block rareness, be sure to check any casting very carefully that you find in the lifter chamber, for a hairline rust-crack lengthwise into the water jacket. This was supposedly a common failure mode for early 400 thinwall castings and is (I think) utterly unrepairable. Dan Jones in Missouri has one- used to be a photo of it on his web site.

On the plus side, there used to be what are called 'main-bearing adapters' that are 3"OD and 2.75"ID, so the better Cleveland-main-size stroker cranks can be used. It wouldn't be difficult for a good engine shop to make a set up from billet steel, either. Back in the last century, people used to install 3" main bearings, then line-bore the big bearings to accept the smaller bearings inside. But billet adapters would theoretically be better for support if you can locate a set. I haven't seen any for some time, but then I don't specifically look for them, either.