I thought they all came with 1.88 valves as well. Possibly not service replacements since the 291 heads superceeded early heads. If someone just needed one head under warranty, they would need a head with 1.72 exhaust valves. I imagine these were bought new over the counter and they installed the 1.72 valves out of the other heads that had issues? Its really all speculation at this point. These heads came off a 427 that was in a 69 Nova. Since these heads have 1.72 exhaust valves, I imagine they would be good for pure stock racing on earlier engines since they are completely stock.
Jason
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