Re: 69 L78 Chevelle Radiator Codes
IA is the code for the Drivers side tank.It is sometimes embossed into the tank itself,facing the engine.
XJ is the code for the Pass.side tank.It too is embossed into the tank,facing the engine.
Together these two tanks w/the core = the BO Radiator.
28 I believe is a plant control ID # of some sort.
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