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1969 or 1970 Big Block Chevy BBC 454 LS6 Rectangle Port Head 3964291 291 casting, date code F-18-9. Chevelle Corvette. Condition is "Used". This cylinder head has been cleaned and magnufluxed to check for cracks. It is sold as-is and will need valve job and all parts. Threads are in good shape- the ports are standard and have not been altered.