If it has a single exhaust outlet it is NOT 1928. If it has two exhaust outlets into a single pipe the HEAD is 1928, but the block may be earlier. If it has side covers it is most likely 1928 also. To be exact: read the dates on the block and the head. Walt is correct on the maximum reading on the oil pressure gages for the 1927/28. Can't verify the average reading listed. Both the 1927 and 1928 engines use the same oil pump, and oil distribution valve assembly. 
RAY Chevradioman http://www.vccacolumbiariverregion.org/1925 Superior K Roadster 1928 Convertible, Sport, Cabriolet 1933 Eagle, Coupe 1941 Master Deluxe 5-Passenger Coupe 1950 Styleline Deluxe 4-Door Sedan 1950 Styleline Deluxe Convertible 2002 Pontiac, Montana, Passenger Van 2014 Impala, 4-Door Sedan, White Diamond, LTZ 2017 Silverado, Double Cab, Z71, 4X4, White, Standard Bed, LTZ If you need a shoulder to cry on, pull off to the side of the road. Death is the number 1 killer in the world.
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