Can anyone tell me if roller cam bearings have to be installed with the oil holes lined up at 5:00 o'clock like other cam bearings. I took my bearings out and there is a groove around the hole where the bearings go ...it doesn't appear to matter how the oil hole is lined up because the oil circulates around the outside of the bearing in the groove in the block anyway.

Any advice?

 

i put mine in with the feed hole at or around 5 o clock

 

The groove carries oil to the main and rod bearings.

The reason you orient them the way ede said, is because if you put them at the top or something stupid like that, the cam (which is being pushed downwards, towards the crank, by the lifters and the timing chain) will leave a HUGE oil clearance gap, and you'll end up with a significant internal oil leak, that will reduce oil pressure and delivery available to the bearings. Putting them in the right way will cause the cam to mostly seal up the feed hole, and relatively little oil will escape the pressurized system by that path.

Doesn't matter if it's a roller cam or not.

On the other hand, if these are *roller* *cam bearings*, and not *roller cam* *bearings*, then it won't matter, because the oil metering orifice drilled in the outer race of the bearing is what regulates oil flow, not the clearance; since there's not really "clearance" as such around a needle roller bearing.