Hey Jim, sbb rods have a .060" offset from the big hole to the small hole. The extra material is on the chamfered side, if you don't maintain(or get as close as possible) the offset the small end of the rod won't be centered on the wristpin. On the Carrillo rods, they are more than likely centered and if they are .900" wide all the material will need to be taken off of the non-chamfered side. So you end up with a .055" offset which is within .005" of the .060" factory offset.(probably way closer than what the factory tolerance was) The Pankl rods may already have a .040" offset so material will need to be removed from both sides. If your Pankl rods are .900" wide you mathematically remove .020" off of the non-chamfered side then divide by 2 the remaining amount to be removed and remove that amount from both sides; .900 - .845 = .055" .055" - .020" = .035" .035" / 2 = .0175" to be removed from the chamfered side. .0175" + .020" = .0375" to be removed from the non chamfered side. Fortunately the chamfer is WAY bigger than it needs to be so removing the .0175" from the chamfered side isn't enough to worry about. To measure the offset of connecting rods, set up an indicator with enough travel to measure at least .100" to be setup on the large end with the small end held or bolted down to a 1-2-3 block. Try to zero it out on the low side then flip the small side on the 1-2-3 block and read the indicator for what the offset is on the big end.