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The Brian Crower dual spring and titanium retainer kit supplies valve springs and lightweight titanium retainers for Subaru FA20 and Toyota 4U‑GSE race engine applications. Intended for high‑duty valvetrain use, the kit supports higher spring rates and helps control valve float at elevated RPMs. It provides a focused valvetrain upgrade for FA20 and 4U‑GSE race builds needing stronger spring hardware.
Brian Crower Subaru FA20 / Toyota 4UGSE-Race Dual Spring and Titanium Retainer & Spring Kit
