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Corse Thread (Under Cut)
AF6000-4001
optimizes drivability
AF66-2045BLK
Valve Spring Cups .060" Thick ISK940-SC Product:1.660" OD, 1.540" ID, .630" ID Corse Thread (Under Cut)Valve Spring Cups . 060" Thick1. 660" OD, 1. 540" ID, . 630" ID ISK940 SC K940 SC Valve Spring Cups locate the outside diameter of the valve spring in relation to the Valve Guide, preventing spring movement which leads to "Galling" on aluminium heads. Isky Valve Spring Cups are manufactured from Chrome Moly Steel, then heat treated for maximum durability. They are designed to fit over . 625" O. D. Valve Guides.
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