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This is a NOS new old stock set of 16 Factory Gm valve springs and retainers . That were used in the Chevrolet Chevy Big Block 375hp 396 and 427 , Thought to be part # 3970627 L78 . They have the yellow paint stripe on them . The retainers are thought to be the L88 style with the seal on the bottom of them . These Springs and retainers have been sitting around since the motors were put together new at the Tonawanda motor plant here in New York . At that time a guy had bought three complete sets in bulk and here is one of the sets . Great shape for they age , They are NOS new old stock ( no box ) , they have some minor surface rust spots from sitting . If you have any questions please ask and thank you once again for your .