You are looking at a pair of 1967 Chevy 327 double hump heads. They are cast # 3890462 and are date matched at L306 (Nov. 30^th, 1966 for the 1967 model year). They are 1.94 / 1.50 valves & have 62.076 CC combustion chambers. This cast # was used in 66 & 67 on the following engines / cars:

66 to 67 327 / 275 HP Malibu, Nova, Impala & Camaro

66 to 67 327 / 300 HP Corvette

66 to 67 327 / 325 & 350 HP L79 Nova, Chevelle & Corvette (w/ 2.02 valves)

67 350 295 HP Camaro

These heads are cores for rebuilding. They come the way you see them. They will need new valves, valve guides, springs, etc. These heads have never been modified. A good set of cores for rebuilding.