Assembly line 396 427 454 PCV V/C Grommet
 

This is original assembly line PCV valve cover grommet for big block Chevrolet's. Originals have the rrc embossed on the face and concentric circles going around the grommet. NOS Replacements have no markings on the top and the part number underneath. It also has six mold release indents on the under side as original. Exclamation condition. 75 shipped to the lower 48. https://www.yenko.net/ubbthreads/pics...7_15.16.57.jpg
https://www.yenko.net/ubbthreads/pics...7_15.16.45.jpg