The "Race City Original Springs" have set the standard for the clone for years.
"Race City Original Springs" will outlast every clone valve spring on the market other then are "Race City Pro Valve Springs"
Springs should be checked prior to installation to insure they meet rule requirements.
All Race City Springs have a small I.D. to help hold the spring tight on the spring retainer and valve stem oil seal, to keep the valve spring from jumping around.
Sold as a pair.