All engines have new push-rod tubes, a new oil pump and a resurfaced flywheel. All engines come with brand new pistons and cylinders and new exhaust valves. Then they are extensively tested for a trouble-free engine. They all get rebuilt crank, rods, cam, and lifters. New main, rod, and cam bearings, all new gaskets, and German flywheel seal.
All heads get new seats, guides, and new exhaust valves, reground on the intake valves.
Then all heads are step cut to take the unleaded, lower quality fuel of today. They all come with new pistons and cylinders. Then tested on the tester to ensure all specs are correct, and that the unit is ready to ship.