KC81VS
KillerCrate Premium 81+ Spring sets for 602 Crates.
KillerCrate buys Genuine GM Springs in Bulk and carefully rate / match them in-house on their high-end spring machine. Each box is coded, and you get what you pay for.
They recommend changing 602 81lb Crate Valve springs every 350 laps however this depends on the length of track and rpm you are running. Springs last longer on short tracks with a rev chip and last a little less when you are running a big track at 6400 RPM!
KillerCrate, the most trusted name in Crate Matched Springs.