[Excaliber]

In some ways you COULD say that. The smaller bore of the 428 block has thicker cylinder walls. The SIDE OILER 427 is a 'thin wall' casting for lighter weight. Thin wall because it also has the about the largest possible bore size in an FE. Some people say it is a good idea to sonic test the cylinder walls of a side oiler to make sure there not to thin. A .017 over bore is common to the side oiler, where as any other typical motor would go .020, .030 or more without hesitation. .020 on a side oiler is pushing the envelope of bore capability. Sometimes side oiler blocks are bored over sized and then 'sleeved' to return them to the standard size.

Now as far as the 427 CENTER OILER (or top oiler) I don't know what the specs on wall thickness are or what your limitations with that block might be. Myself I would much prefer a 427 block over a 428 simply because of the bigger bore. I prefer a big bore short stroke application over a stroker application, but thats just me. Short stroke builds rpm faster and is more consistent with the original intention/design of the 427.

If I had a 427 block there is no way I would consider a modern block over that!