[tekuhn]

It looks like King MB5511XPSTDX are .001" oversized, but they are non-grooved lower and I have a straight-shot oiling crank, so I need fully grooved. Their MB5523 is fully grooved, but not offered in STDX. Kings catalog is very difficult to read through, but it looks like MB5523 is made using MB5511 uppers. I guess I could by 2 sets of MB5511XPSTDX to get a fully grooved set. Expensive, but still cheaper than a machine shop.

[firechickenman]

Originally Posted by tekuhn

I have a straight-shot oiling crank, so I need fully grooved.

I was under the impression that half groove mains are recommended for high performance applications even with a non-cross drilled crank. The non grooved lower provides a wider hydro-dynamic wedge for better crank protection and the rods still receive plenty of oil. Maybe someone with more knowledge in this area can shed some light on this.