i actually just realized something...for one the part numbers on each bag for the valves are supertech part numbers "HIVN-1020D/SK." I'm guessing the "SK" at the end is just for Skunk2 cause the valve faces say "S2" on all of them. I also just took all the valves out of the box for the first time and found that one of the intake valves is flat faced while all the other valves are dished. Gotta love Skunk2 for "their" "high-quality" parts. I don't regret any shitty thing I have ever said about them. I don't even know why I bought these valves, they were on their clearance sale page for a good price and I couldn't find any horror stories about them, so I went ahead and bought them, won't make that mistake again. I'll stick with companies that actually design, manufacture and stand by their own parts next time. Just thought I would let everyone know.