The engine I've bought is an old British Ford Essex 3.0L V6 a basic push-rod engine. It's heavily built because it was originally designed to be both petrol and diesel. Which I thought was ideal to explore the theory I had that if an engine was built exclusively to run on ethanol, it would be much more economical and powerful than currant petrol engines. The engine was originally designed in Dagenham, Essex in the 50's. It's got a distributor and has a carburettor so a purely mechanical engine. It did 20 to 23 MPG and was optimized for 4 star petrol in imperial gallons.
I had the block and crank machined at Cornwall Engines to accommodate the changes. The engine is quite large displacement for private cars in the United Kingdom at nearly 3.1L as now it is 60 thou over size, but it's far from cutting edge. I've replaced the piston from a 200 cubic inch Ford straight six and the con-rod from a 351(W) Ford V8 and had the crank reground to 3.1 inch.
The US Department of Energy (biofuels section) commissioned in the 1990's a paper that translated and combined all the idea's and theories of ethanol in both Pressure ignited (diesel) and Spark ignited (petrol/Gasoline) into one paper the writers were of the opinion that dedicated ethanol vehicles would be available in the new millennium that ran either on E85 , E95 or that Flex-fuel cars would be able to optimise the engine for the precise mix of ethanol and Gasoline by increasing the compression.
Dedicated e85 cars with the engine optimized for e85 aren't available nor are cars with engines that have bottom ends that are the same as those fitted to petrol engines. So direct comparisons between unleaded and e85 are difficult.
I've had this engine assembled of Ford parts doing only machining to make them fit together. The head is compatibly flat as the engine was designed as a Heron type