@IaM-Ray Yes it'll fit. If you look at the coolant fill tank you'll see the normal style plenum lies flat and is lower than the fill tank. The highest point of the Z-head style is about the same height as the fill tank and the long side of the plenum is oriented vertically. That arrangement gains almost all its height at the rear of the engine compartment. Greg said it would fit fine before I went this route. It's been fun to study the photos. I had talked all this out with John at Outfront, but hadn't actually seen it in the flesh. The runners are designed like an equal length header with valves all the same distance air inlet. The intake path looks like it's slightly longer, too, which in theory should help torque. The air path also doesn't make any sharp 90* bends like it does in the older arrangement, so that should preserve high RPM flow for hp. at least that's my story and I'm sticking to it. We're still a long ways away from seeing the whole package on the dyno.