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When I built my 3.2 I had my center main journal crossdrilled. I did not groove the crank journal or the bearing. I talked to two different expert builders and got two different opinions. One said it would help provide lubrication to the two adjacent rod bearings which are usually the last to receive oil pressure that normally comes from either end of the crankshaft. The other builder said crossdrilling is a waste of time unless you also groove the journal or bearing and open up the diameter of the oil supply passage in the engine case itself to the center main bearing. And you should also use a turbo oil pump if you want to really do it right. So the question is: do you really need it? What are you using the engine for? How fast are you going to spin it?
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