Just thought i would post up a link to a few X-flow parts my mate is selling. He had a Miniford, X-flow engine mated to a Mini gearbox which he was going to rally a few years ago. Had the engine built with all the proper bits and it produced big power but unfortunately the gearbox casing couldn't take it and never did any more than a few hundred miles running in. Been stood for some time but i'm sure would go to creating a pretty good engine.

X-flow bits

Is that a steel crank do you know?

The second photo of the crank shows what I think are casting marks. Theres a casting line right across the end. I think its cast iron rather than steel.