I have five sets of SBC heads, all of which have undergone hot vatting, cleaning, and magnafluxing to detect cracks. The sets include one set of 441 heads, two sets of 487 heads, and two sets of 882 heads. They have all been thoroughly inspected by a reputable high-performance machine shop and are confirmed to be crack-free. These heads are bare and ready for assembly; no port work has been done except for one set of the 882 heads, which has had exhaust port work completed. The remaining sets are unaltered. To reiterate, these are bare heads without valves, springs, locks, or retainers. I have all the stock parts that were removed from the heads, and you are welcome to take any or all parts if desired. The price is firm at $300 per set. You can choose one set or multiple sets at the same price of $300 per pair. No trades will be considered. Additional pictures will not be provided; the heads shown in the provided pictures are from the machine shop that performed the cleaning and magnafluxing and are not for sale. The price is $300 per set, firm, and I will not respond to inquiries asking if they are still available.