IMO, The Parts Place is playing "fast and loose" with their terminology, just like GM did in the 1960's. If GM could get away with calling pearlitic malleable cast iron Armasteel, then why not he "Parts Place"? It is just a merchandising term that sounds cool that they were able to trade mark. It is a high quality cast iron product, better suited for high performance than gray cast iron. It was also used in the Pontiac cast connecting rods. But if I was going to go to all the work of fitting 4 bolt main caps, I would go straight to billet ones.
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