Porsche 911 brass base ring / gasket for Nickies™ machine-in cylinders, set of 6 pieces. 97mm ID, 0,25mm thick.

 For Porsche 911 2.7 engines equipped with 103-89, 103-90, 103-92 and 103-93 Nickies cylinders. Used to set the deck height correctly; .040-.060” (1 to 1,5 mm) deck height recommended for most applications.