Always is the aluminum Toyota V Hemi, inspired by the Dodge Red Ram Hemi 159 ci to 241 ci, just a few ci off from the original dodge displacement.
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A better British-developed alternative that could replace the by then aging Armstrong-Siddeley V8 would be Bristol co-developing the OTL Rolls-Royce / Bentley N-Series V8 project (originally 4.5-5.0-litre / 5.8-6.0-litre prior to being discontinued) mentioned in both the link below as well as from Bentley's Great Eight by Karl Ludvigsen.
It was around that OTL period from the late-80s early/mid-90s that then Vickers owned Rolls-Royce / Bentley were looking to make to money, while smaller high-revving engines such as the N-Series V8 would be especially more useful for Bristol then Rolls-Royce / Bentley (the BMW V8 / V12 powered models being less well-regarded) with the development costs for the project being atomized by ATL Bristol's involvement with the N-Series project and that is assuming ATL expanded Bristol even needs to co-develop engines when it should be able to develop its own engines without any problems.
https://en.wikipedia.org/wiki/Rolls-Royce_V8_engine#N_Series_V8
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