COMP Cams Part# 503-16 

Positive Stop PTFE Seals

Specifications:

Valve Guide Diameter (in.) 0.530"    Valve Stem Diameter (in.) 11/32"  Valve Stem Seal Material: PTFE     Valve Stem Seal Type: Positive Stop

Manufacturer's Part Number: 503-16

Set of 16 seals

Brand New sealed package.