Brian Crower Nissan SR20DE/DET Single Spring & Titanium Retainer Kit

Brian Crower Single Valve Spring & Titanium Retainer Kit — Nissan SR20DE/DET (BC0200)

A system-matched spring and retainer package for the SR20, designed to work in unison for better valve control at extended RPM and to support greater lift camshafts.

The retainers are where the gain is. BC titanium retainers weigh roughly 40% less than the factory steel units, CNC machined from premium 6AL4V titanium bar stock. Less reciprocating mass at the top of the valvetrain means the spring has less to control, which raises the RPM where things go unstable.

Springs are wound from the highest grade super clean chrome silicone alloy, with proprietary processing — chamfering, deburring — for consistent pressures over long-term high-RPM use. Quality springs are what prevent premature valve float, and float is what puts a valve into a piston.

Spring specs: 1.980" free length, 90 lbs at 1.550" seat, 220 lbs at 1.025" open, 0.910" coil bind. Uses the OEM spring seat. Net cam lift capability 0.550" / 13.97mm.

Fitment: Nissan SR20DE and SR20DET. S13, S14, S15.

Required with aggressive cams. BC specifies this kit for their higher-lift SR20 profiles to avoid coil bind with the OEM spring. If you're installing cams past stock lift, this isn't optional.

Do it while the head is off. Springs and retainers are a head-apart job — if you're already in there for cams, valves, or a valve job, that's the time.