Would this Slant 6 oiling mod do any good?

[timk225]

I was just google searching articles on high rev Slants, and read more than once about the #5 rod and oil problems, but also high rpm camshaft oiling issues. That might be less of a problem than the rod bearing.

Anyway, I was thinking what if someone machined or cut a groove in each lifter bore, on the passenger side of the hole, top to bottom. That seems like it'd let oil go out the bottom and right into the path of the cam lobe pushing up on the lifter.

For the #5 oiling issue, hasn't anyone drilled the block and crankshaft oil holes a few drill sizes bigger to increase flow?

 

[RustyRatRod]

I've found running a high pressure spring in the pump works fine.

 

[Charrlie_S]

When I first started racing slants, I did have some issues with the #5 rod bearing. After going to full groove main bearings, no more problems. I do make sure there is no restriction in the oil passages in the block and crank. There is a article about grooving the lifter bore, and adding "stand pipes" in the lifter gally to help with lobe lubrication, but I have never done it.

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