The one with a a very high exhaustport is serious tuned and with welded KIPS-flap.
Duration approx 195-200 degrees 8000+rpm.It seems this is a "Dragracer"(maybe alco) without any need of low powerband.
It has a very nice radii in every corner of ports too(nice to piston).
If you copy,don?t go so far-out
The other one is more suited for average rider.
(you know you have to replated after tuning, if you don?t have sleeve)
Mun, do you see the very low inlet boostport?
It?s seems that transfer port a angeled upward too
Plz ,take some more pics in more various angels of this two barrels ,just very interesting for a tuner as us!
//doordie