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The Supertech dual valve spring kit for Nissan SR20VE DOHC specifies an inner spring boss machined to increase net lift, per the catalog note. The description calls out SR20VE DOHC and the machined inner spring boss detail. This Supertech kit is intended for SR20VE DOHC head work where the modified inner spring boss is required to achieve the noted net lift for that engine.
Supertech Nissan SR20VE DOHC Dual Valve Spring Kit (Increase Net Lift Machine Inner Spring Boss)
