Aluminum riser. 1" high. O-ring sealed on top. Bottom cut to accept restrictor or thermostat. Available with -6ORB Ports in back for water system. Small or Big block Chevrolet.
2-1/2 Inch diameter x 2-1/8 Inch tall. Replaces OEM GM breather 6421868 on late 1965-1967 GM Big Block. This is a high quality original equipment style breather that will give you that original look...