F527JC F = Flint, MI engine plant
5 = May
23 = 23rd day
JC = probably means 235 truck engine with a heavy duty clutch
The above correct plus add below.
1958-62 235 Thriftmaster
JC, Base engine on C40, K10, 20 (C10, 20 30 with RPO 223 Heavy Duty Clutch equipment)
Standard Disc 10", Heavy Duty Disc 11"
Source;
1960 Chevrolet Truck Resto Pack Actual Pages 5, 7, 23
