Kelford Valve Spring/Titanium Retainer SetNissan RB25 NEO beehive spring and titanium retainer kit to suit 6mm stem Ferrea valves (F1934P, F1936P). 86lb @ 37mm intake, 89lb @ 36. 55mm exhaust. 22. 85mm coil bind. Fit 1. 5mm shim on top of factory spring base. Only to be selected when using Ferrea F1934P and F1936P RB25 Neo valve. Must use K10063 locks.
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