The 1956 Chevrolet 235 6 cylinder engine's valve cover was cleaned up and painted using Duplicolor Chevrolet Blue Engine Enamel (see pics). 05I7668F56Z stamped behind the distributor hole tells me: 1) 7668 means this engine was the 6667th engine made that year because unit #'s start with 1001 at each plant; 2) the F means Flint, MI Assembly Plant; 3) the 56 means assembled in 1956; and 4) the Z means regular 235 found in the 150, 210, or Bel Air Cars (not the Corvette).
