1964 set of 6 rebored cylinders, size .040: all right, there it is, ready to install, they have no broken fins. Included is a core charge of $90 for the set, refundable to you upon receipt of your rebuildable cores. Please send within 30 days of receiving your parts. we cannot accept cores already in size .040; no broken fins. Don't hesitate to contact Rafee at 918-753-2486 with any questions you might have about this item, or the cores. we also carry piston rings , gaskets and many other engine parts available in this category.