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Designed for LS1, LS2, LS6, LS7 Gen III General Motors applications these dual valve springs are designed for up to .650 lift. These springs can be installed with no machining but require the use of different spring retainers and spring seats.
Part number: 26921-16 Description: Dual Spring OD: 1.300 ID: .665 Seat Pressure: 135 @ 1.770 Open Pressure: 400 @ 1.220 Coil Bind:1.040 Rates Per Inch: 408