Piston oiling

[Shane]

New rod bearings (Clevite 77) don't have notch in lower half for oil passage through rod to squirt oil on bottom of piston. Do I need them?
Mopar 5.9 Magnum block

[Chryco Psycho]

doesn`t hurt , you could probably grind a notch in the brgs

[moper]

No, you dont need them.

[Chryco Psycho]

it feeds oil to the cylinder walls , helps cool the piston & helps lube the cam ... still can`t hurt

[femtnmax]

I notice many of the rod bearings now don't come with the notches.   Also, many of the new engines are NOT set up to oil the cylinder walls, and engine life is longer (in general) than ever.  Maybe the extra oil was promoting a emissions problem.
All the oil that is fed to the rod bearings has to go somewhere, which must produce lots of oil spray off both sides of each connecting rod.  I'm guessing that spray must soak the cylinder walls with oil.

[Chryco Psycho]

still needs to oil the cam & cool the piston

[moper]

The change comes from wanting to control the oil windage, and cut down the oil the oil rings need to remove from the cylinder walls. It can hurt ring seal and cause emmissions issues in factory engines. So they stopped when piston and ring and wall finishe got better.

[Shane]

I ground small knoches to allow the oil squirt. Everything I could find about the subject of small block rods said it was critical to make sure rods were aligned properly to allow for piston cooling. Thanks for your input