Chrome Moly Steel retainers 1.080" OD, .735" ID (.060" Higher than 507-ST) ISK50 Product:For 5005, 6005, 6105, 6205, 8005-A, 8305, 9005, 9105, 9265 Valve Spri Severe duty use on oval

Severe duty use on oval tracks

Compression Ratio with 64cc chamber volume: 11

not plastic like stock or starters sold at a local parts store

3/4 Hole Teflon

The alloy EWP improves engine cooling control & capacity while giving you more power & improved fuel economy

Chrome Moly Steel retainers 1.080" OD, .735" ID (.060" Higher than 507-ST) ISK50 Product:For 5005, 6005, 6105, 6205, 8005-A, 8305, 9005, 9105, 9265 Valve Spri Severe duty use on ovalChrome Moly Steel retainers 1. 080" OD, . 735" ID (. 060" Higher than 507 ST)For 5005, 6005, 6105, 6205, 8005 A, 8305, 9005, 9105, 9265 Valve Springs ISK507 STA K507 STA Isky 4130 Chrome Moly Light Weight Steel Valve Spring Retainers are ideal for street and highly stressed competition applications. They are specially heat treated and black oxide finished to protect against corrosion. Set of 16 4130 Chromemoly steel retainers.