Kibblewhite Precision Valve Spring Kit 60-60280 80 Lbs of Seat Pressure / 205 Lbs @ 0.435&quot; Lift (Max) Spring kit is designed for compatibility with the OEM integrated Seal/Base (OE# 3610212) where applicable Lightweight heat treated Steel Retainer and Beehive Spring reduce reciprocating mass while providing the spring forces required by high performance boosted racing applications.