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The Riley heads are very good, make good power and pretty stout.
But, there were many castings sold not machined and that left some to be machined with questionable techniques. I have had a couple of heads come in for evaluation after the owners attempted to install and run. The operable word here is attempt, one did not fit on the block (stud locations) and the other, well lets just say some of the internal passages were interconnected (leaks of water into ports and chambers).
Caveat emptor would be the caution here.
John
PS, one ended up polished and looked great hanging over the mirror in the bathroom....