I am redoing a 22' jet boat with a chevy 454. I am in the engine now and I noticed there are 5 extra drilled holes in the oil pump sucksion screen. what would be the purpose of that? mabey more oil flow or pressure? I know alot but i also have alot to learn. I want this engine to run good. Real gud! I want to lean the secrets of putting horsepower in a big block. I just joind this site and look forward to making friends and helping others.