COMP Cams - 521-16
Valve Stem Seal - Positive Stop - 3/8 in Valve Stem - 0.500 in Guide - Steel Body / Viton - Set of 16
Providing the best sealing properties and spring clearance, viton valve seals are an excellent choice in performance applications. The 521 seals have a .545" OD and fit applications with 3/8" valves and .500" OD guides.
Seal Outer Diameter: 0.545
Valve Guide Outer Diameter: 0.5
Valve Seal Type: Metal Body Viton
Valve Stem Outer Diameter: 3/8
Amazon ASIN: B002EE6AY0
C.A.R.B. Exempt for Racing and Off-Road Only Vehicles?: Yes, but must be a race/competition only vehicle.
C.A.R.B. Exempt for Federally Certified Vehicles Manufactured Before 1967?: Yes, but must meet tailpipe emission standards for year of vehicle.
C.A.R.B. Exempt for California Certified Vehicles Manufactured Before 1965?: Yes, but must meet tailpipe emission standards for year of vehicle.
C.A.R.B. Exempt for Foreign Vehicles Manufactured Before 1967?: Yes, but must meet tailpipe emission standards for year of vehicle.
C.A.R.B. Exempt for On-Road Vehicles?: Yes
C.A.R.B. Exemption Reason: No impact on pollution output of vehicle.
C.A.R.B. E.O. Number: N/A
