Nice pair of 3927186 heads that are rebuilt. I purchased these heads from different suppliers and were not a matched set. One head is dated A-21-9 and B-19-9. Heads have been thermal cleaned, mag nu fluxed with no issues found, new stainless Elgin valves, hard seats, nurailed guides honed to fit, seals, springs retainers, keepers, 3 angle valve grind, and surfaced. Ready to bolt on! Please see pics. Shipping is for the lower 48 states. Thanks