Three of the most famous small-block Chevrolet engines ever built, the 302, the 327, and the 350, share the same 4.0-inch bore, the same block casting, and in many cases the same casting numbers. Only the stroke tells them apart. This third installment in our small-block series follows the 4.0-inch bore family from the 1962 327 through the 1968 journal change, the Trans-Am 302, the Duntov cam, and the 350 that eventually powered everything from Corvettes to delivery vans. Read on to find out how one casting did so much.