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Since the heads can be installed either way, the rear of the heads have outlets for the water crossover. We plugged the holes with freeze plugs. Prior to installing the rear cam plug, we installed the spring ring in the block that secures the camshaft.
Building a Better Buick, Part II

Since the heads can be installed either way, the rear of the heads have outlets for the water crossover. We plugged the holes with freeze plugs. Prior to installing the rear cam plug, we installed the spring ring in the block that secures the camshaft.  View Related Article