Thing is depending how tight the bearing is pressed on the crank , it'll tighten up the inner clearances , then add the high heat which also tightens the clearance is possible to be a bit too tight , probably why the C4 was spec'd in the first place , I guarantee if the less expensive/common bearing was known to be fine , they would have used them from the factory rather than some special high dollar versions . Modern bearings are probably better quality than back in the '80's, so may be fine then .
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