Supertech Performance SPRK-H1021D-VE Dual Valve Spring 138 @ 37.5 SPR-H1021D-VE + RET-NSR20/T1 + Fact Seat (to increase net lift it is necessary to machine inner spring boss)
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Supertech Performance SPRK-H1021D-VE Dual Valve Spring 138 @ 37.5 SPR-H1021D-VE + RET-NSR20/T1 + Fact Seat (to increase net lift it is necessary to machine inner spring boss)