Built by Carl Ruth (renowned for building motors for race cars in Pennsylvania)100 hours of labor in each engineEverything is interchangeable between each engineBoth Engines completely balancedEngine stands included 350 cubic inch Chevy Corvette Blocks 202 Double Hump Heads 65 cc chamber Roller Cams Roller Rockers Matched ports and intakes Deep oil pans (each holds 7 quarts oil) Forged cranks Forged pistons 6 inch rods New valves 4 Bolt mains Brodix valve covers Motors are blue powder coated