When going from bolts -> studs they need to be installed, torqued down, and the cylinder or mains (studded parts) need machining to re-create the round holes.
The head requires a deck plate studded down for this
In the mains of sr20 I've never tried studs but I assume its the same as other engines, align bore/hone with studs andno bearing, then install bearing and torque without crank to check with dial bore gauge and mic the crank, reorder correct bearing, repeat as necessary until all are round and proper clearance. then install crank
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