i've never used a Source crank before but have heard of them having large fillets. unfortunately, this is a case of not checking things. this wouldn't be difficult to check with a couple of new bearings and a magic marker. rod side clearance should be checked too. measuring big ends of the existing rods and comparing that to a stock rod, doing the math, should get you close to where the clearance should be, IF the filet/bearing clearance is correct. i'd still go thru the oiling system to make sure there's adequate supply. keep in mind the rod bearing is one of the last parts to get oil. adding some chamfer to the bearings wouldn't give me heartburn considering the alternative.