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Cylinder Head Valve Spring Set - 928 | 1978-1982 SMC-107-924-00 Alternator Bracket for 645Ci (2004-2005)Cylinder Head Valve Spring Set For Porsche 928 (1978 1982) Models. Complete cylinder head valve spring set for Porsche 928 engines. These precision springs control valve opening and closing cycles, maintaining proper timing and preventing valve float at high RPMs. Built from premium spring steel with exact rate specifications matching factory requirements. Engineered to deliver consistent performance and durability under extreme thermal and mechanical