Man, this little job is a little trickier than I imagined - just f---up an exhaust seal as I have a hard time sensing when they are seated correctly, (metal jackets) the valve stem seal for the intake (green) is much easier to sense and really only needs finger pressure to seat/slip on so now I need a single exhaust valve stem seal . . . . . arghhhhh . . . . . I wish that there was a nifty little trick out there in wrenching land for this or I wish I had an extra valve guide to play around with so that I could better gauge pressure required to fit exhaust seal - not liking this job and even worse, most of my seals seem fine (versus being broken or riding on stem)