I have 2 4819 heads in my garage. Not sure of the years but casting numbers are in different locations. They both look the same possibly a very small dome piston? Not sure. Can we see pics of what you have on your engine?
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1947.2 GMC 1/2T SWB panel
1947.2 GMC 1/2T long bed
1948 GMC 1/2T short bed