Just by dumb luck I have a 261 with a 848 head on it. I thought I was purchasing a 235 from a neighbour, off of his barn floor. It needed a rebuild and then I discovered it was a 261, widely used in Pontiacs here from 1954 til 1962. A year after the rebuild, I heard that the 848 head was a desired head so I checked my numbers on the head and it was an 848. I have no clew how much horsepower it has.
