Chevrolet Performance Valve Spring Retainers - LT1/LT4 (16) M59M1 and precision J-form threads rolled

and precision J-form threads rolled after heat-treat to create a fastener that has threads 1000% stronger than others

and jam nuts

GPS Display

Cutlass 1987-1985

1986-1991 Mercury Grand Marquis

Chevrolet Performance Valve Spring Retainers - LT1/LT4 (16) M59M1 and precision J-form threads rolledProduct Description: Valve Spring Retainer 7 Degree 0. 640 in OD Step 1. 320 in Single Spring Steel LT4 GM LS Series Set of 16 Chevrolet Performance has a wide selection of performance upgrade parts specifically for GM vehicles, as well as crate engines, you can add proven performance to stock vehicles. Looking to personalize your vehicle? Chevrolet Performance is the place. Inside youll discover a complete portfolio of Chevrolet, Buick, GMC and