i can see on the 90-93 cam that there is a race on the 'nose' where the cam gear i believe goes over and seals with the cam seal... Could this be why we have leaking cam seals/cam area and/or bad cam gears? most dont know but the 90-93 cam gears are two pieces machined together, making them more prone to warping having a load and rotating mass on them... if any of this info is mis leading, please delete or correct me..heh...