I recently purchased a fresh copy of a book that was published back in the late 1970 s at the peak of small block oiling development to make sure that I was understanding this issue myself.
The book discusses both approved mods with the issue being number four main bearing starvation caused by excess oil velocity in the right side oil galley.
Can you provide the name and information on this book that clearly explains Mopar oiling?
Thanks!
The books that I mention are as follows. " How to build Dodge/Plymouth Performance." Published by SA design and written by Larry Atherton and Larry Schreib.
The other is the How to build big inch stroker small blocks by Jim Szyilygy ( not sure on last name spelling)
The first book discusses the inherit oiling problem of Number 4 bearing and the two approved and tested fixes.
The other book discusses the new not to be confused crossover tube to improve oiling to the rockers and main bearings.
Hope that helps
Duane