Porsche 911 Copper Base Shim w/ 97mm ID .030″ thick, Set of 6

Porsche 911 copper base shim / gasket for Nickies™ machine-in cylinders, set of 6 pcs. 97mm ID, .030″ (0.75mm) thick. For Porsche 911 2.7 engines fitted with 103-89, 103-90, 103-92, and 103-93 Nickies cylinders. Used to correctly set deck height; .040-.060″ (1 to 1.5mm) deck height recommended for most applications.