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what is the benifits of block notching and has anyone drilled the holes on the bearings to match the crank oil holes?

 

Block notching allows you to use bigger rods. I don't think there is another reason for it.
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OH.

 

Be advised, not only do you need to notch the block with Eagles, but you should with Crower I-beams as well, as the block heats/expands you need to make sure there is enough clearance there, I notched my ZC block just incase.

Jeff