I recently helped replace the stock camshaft and rocker assembly in the CR-Z with junkyard parts from a GE8 Fit that had 19,000 miles on it. Unlike the CR-Z, the GE8 Fit fully opens both intake valves regardless of RPM. The GE8 camshaft also uses higher lift and duration intake cam lobes and has a separate cam lobe on it that is only used during VTEC. The differences between the two camshafts can be seen here. The CR-Z was purchased used with about 17,300 miles on it and has about 52,300 miles on the odometer now. The car also spends three to four weekends a year at track days and has accumulated over 1,300 miles of use on the racetrack. Low-end torque has definitely improved with the new parts. We'll really know how much of an improvement it's made at the next track day. The engine has mostly used Castrol Edge since it was purchased. It's been running 0W-20 in the winter and 10W-30 in the summer. Here it is with the new cam and rocker assembly installed. All the casting marks were removed from the rockers and the valve adjustment screw lock nuts were replaced with titanium ones to reduce strain on the assembly.