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HPD engine can't be stress mounted in the Oreca-Acura because it's a stock block engine. Neither can the GM V8 in the Cadillac or the Nissan in ESM's Ligiers be fully stress mounted. By which I mean bolted directly to the monocoque vs being mounted in a sub-frame.
If you're going to redesign a stock block engine to be fully stress mounted, may as well start from a clean sheet of paper.
The only thing stock on these engines are the basic block and heads, but the basic block and heads aren't designed to be bolted to the tub as an integral member.
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