For the Douche Bag PM'er hung up about HO heads...in 1976 the 455-HO is not what one would consider a true "HO". It was just a marketting ploy by Pontiac, there's nothing special about the d-port heads that went on the 455 "HO" in 1976, or the power it produced as compared to the 71-72 455-HO.
What he has there are beautiful round ports, and if they are HO they will have a 197 or 7F6 casting.
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Just a blind squirrel looking for a nut.
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