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Ok. But I'd say the same still applies. Surely your builder knows what he is building and to what tolerances and limitations? As a punter, I'd go to a engine builder and say for example: "I want a 3.6 with an aim for reliable 400hp. I'm not so bothered about low end torque as I'll be using it on a circuit so I want to be able to work the engine hard to get the power out of it so it needs a safe, but high redline. What can you build me?"
The project has morphed from “Neil wants more zing” to “commercially offering 400bhp rebuilds of the M96 motor”, so the engine builder was after guidance on what we thought would be appropriate for something offered for sale. For e.g. if you bought an engine from us where we specify a redline of 8,200rpm and the entire valve train turns into shrapnel at 8,300 then I’d say you have every right to be a bit cross.