Guessing, my money would be on 1.940s based on the space between the valves... The casting book says it could be either, but I don't remember any stock 2.02s back when these heads were the "hot ticket" for your grocery getter 283/327.. If it is important I can get a for sure measurement, but I'm almost sure they're 1.940s/1.500 stockers.. I think the 2.02/1.6 would triple the price easily!!!