Car appreciation... the aesthetics, the engineering, etc

This is cool stuff. What was the motivation? Just to get more contemporary performance or just because you can't help hot rodding? Both reasons equally valid.

I wanted to rebuild it to engineer out the weaknesses that Porsche left - the IMS, the bore ovality, the unsupported crank and associated RMS issues, the heating and oiling (under severe load).

Doing this involves (amongst other things) the new cylinders - at which point it's the cost of new pistons to get the capacity increase.

But - the issue with upping capacity and changing nothing else is that whilst you move the entire power band up you also move it left, so peak power rises to (say) 340 bhp, but it also moves to 6,000 rpm rather than 6,500.

I started thinking about what we could do to keep the engine revving out to it's previous peak, which lead to the discussion with the engine designer, his flow bench, new cam profiles being created and so forth.

I'm also going to use the oiling and cooling upgrades from the X51 Power Kit, including the new sump, scavenge pumps, and additional centre radiator.