| The "higher tolerances" claim is false. Some of the newer replacement cranks do have an additional journal size (grade 5), but that has nothing to do with the final clearances. If anythign I would consider that crank made to less tolerance because more total variances in the journals. Nissan Motorsports does sell a VG30DETT crank in ther catalog but it is an OEM crank. They list several common OEM replacement parts.
Russell Floyd Z1 Motorsports www.300zx.com 1990+ Nissan Z specialists Used Parts, New parts, Service/Repair and Performance Z1 Motorsports Exclusive Parts Line 2877 Carrollton Villa Rica Hwy Carrollton, Ga 30116 770-838-7777 770-832-9253 (fax) 
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