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A freind had an aftermarket block recently that the oil feed passage to the head was into the coolant passage. Easy to diagnose. Remove the oil pressure fitting at the back of the block and plumb shop air to it. Ours blew coolant all over. Ended up pulling the heads and watching for bubbles. Just below the deck on the right side the passageway broke through into the coolant passage.
Doug



I have seen this several times with the later blocks that feed head oil directly from the galleys. I even had a KB block do this because the gun drilling drifted slightly. Fixing it however took some work because we had to epoxy in a tube.