Drill new hole in cam bearing ??

[Lugnut28]

I am rebuilding my engine and I read a book by Jim Ruggles, Stage 1 V6 performance guide. In there he says that the factory holes in the cam bearings are too large. he recomends drilling a .090 in. hole in new cam bearins 90 degrees from the stock hole. When you install the bearing line up the new hole with the holes in the block. He says that this alone will increase your oil pressure by 15 pounds. Is this a regulaly thing done when you rebuild you engine? If so has anyone else done this and were the results an 15 lb.oil pressure increase?
I have read about incresing th oil holes in the block?? Should I do these modifications ??




Glenn

 

[Lee Thompson]

Oil holes

This does work. 15 psi , I/m not so sure about that. This is what I do. Leave the #1 bearing as is. Drill the .080 in. hole in the remaining 3. Line the new hole up with the bottom of the feed slot in block. In other words install the new hole as close to 6 o'clock as possible. Radius all oil flow passages, front cover also, No more than .002 end clearance on the oil gear cover. Keep rod and mains at .0015 max. You will not need a high volume front cover with these mods.