Frank The AMC 401 ( 390 too) pin is 1.009 ( some show 1.007 and 1.006). Bigger then a lot of engines out there. The small end on the rods are too BIG, if they were too small, yes honing them out would be the fix ( just like the big end, too small, honed them out to spec). Andre " A.J." Jacobs, web page http://southtexasamc.tripod.com (830)-980-3165 , akjamc@xxxxxxxx Owner & Proprietor, South Texas AMC