The narrative in the book mentioned below, from the author's ,George Reid ,viewpoint includes detail comments and pictures on all the BB regarding reliability, casting etc, Too lengthy to type , some very brief excerpts regarding 427:
" Undoubtedly the most desirable Ford high performance block going is the 427 because it shares nothing in common with the rest of the " FE " line up. It's high-nickel content gives it extraordinary strength "
" The earliest 427 blocks had the 390 High Performance oiling system. Ford soon learned that at high revs, the 427's # 2,3,4, and 5 main bearings could sometimes become oil starved, resulting quickly in bearing failure-or worse."
".......Ford cast an entirely new FE casting called the Side Oiler block early in 1965 where the mains receive a wealth of oil pressure thanks to oil galleries which fed the mains from the sides of the block "
Only mentioning what the author states, but the book appears to be a resource.
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The CarTech publication " High Performance Ford Engine Parts Interchange " lists 20 Ford numbers from 1963 to 1968 as 427 High Performance including Side Oiler, Industrial and Marine, Chapter 11 page 94, available as a download @ $4.00.
http://www.cartechbooks.com/vstore/s..._ID=2933&DID=6