In Stock and ships from our Texas warehouse Very nicely made set, 39mm Bore, Flat Top Piston, 82 and newer Z50R Does not fit 1978 and earlier Z50A Complete Top End Rebuild Kit Package includes: Cylinder head Cylinder body Head gaskets Piston and rings, wrist pins, clips Preinstalled Rocker arms Preinstalled Intake/ Exhaust valves Hi-lift Camshaft Camshaft sprocket USPS Priority Shipping in the United States. Ships Next Business Day! We offer free no hassle returns and a 90 day parts warranty. We stand behind our products.