These started out as brand new LF4 cylinder head cores, and they were CNC ported by Frankenstein Engine Dynamics, the best in the business! However, we made the decision to continue running stock cylinder heads on all our cars. We have over $4,000 invested in these cylinder heads and these would probably retail for around $6,000. Brand new, never used. These will be sold as a pair, and no core charge is required. Price also includes ground shipping to most U.S. destinations.