Originally Posted by wingracer
Well, if the center to center is the same but the BP has a slightly smaller crank pin hole and you measure it from the end of one whole to the end of the other (ID to ID) it would read slightly shorter. Ream it out and it would be the same.
Not saying that is the case, just speculating.
That wouldnt change the center of the end you reamed, the center would stay where it is, you're just making the hole bigger.
In order to measure the distance from center to center, you need to meausure to the outside of the ID of each journal, using the ID side of the caliper, then meausure the ID of each end, divide the ID of each journal by 2, and subtract from the first measurement. That will give you the center to center measurement.
Hope it makes sence.