Originally Posted by Ex-Finesse
Add up what you'll need for the top end to take 9k before building the bottom end to take it.
You'll need, double valve springs, 1-piece valves, titanium retainers, oversized solid lifters (requiring additional meachine work to the head) verniers and billet cams.
That lot makes the £1,300 steel crank look cheap

Failing that just rev it to 7k and drop a couple of gears