I fitted GTR cams in the RB25DET and found, as advised by Ben at Racepace Melbourne (RPMGTR), that they have too much ramp angle causing loss of compression at low RPM, say under 5000, but over they felt pretty good, really good. These were the ones that destroyed Roy's top end, yet they worked to expectation in mine after a polish of the journals. I will be getting a regrind of the flanks to allow for use with the hydraulic lifters and will be posting results elsewhere.