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We are now offering two high performance "B-HIVE" Valve Springs that are "drop-in" replacements for the Stock LS-1 "B-HIVE" spring. Both Springs are compatible with stock retainers and locks... but we highly recommend for increased performance, the use of our ISK135-ST steel retainer and ISKVL-500 Machined Bead Locks for LS-1 engines. These springs also suit early Chevy Small Block engines when used with ISK165-ST steel retainers ISKVL-32 locks