Its engine, the VRH35Z, was a 3.5L V8 which used an aluminium block, as well as having a lower center of gravity and a better ability to be used as a stressed member over the RB26.
Nissan's new twin-turbo VRH35 3.5L V8 DOHC engine was mounted in a stressed installtion for better chassis rigidity and produced up to 950bhp.
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For the R391, Nissan would decide to use a new version of the VH engine, opting to no longer use turbocharging as they had on the VRH35L.