I missed your post, I have a 78 kz1000 ( bike ) that I swapped out engines last year with a 77 (engine) after rebuilding the bottom half.
I ended up getting the Liska gears and bought them straight from Liska ,
www.liskas.com/ good people and very fast delivery out of New Jersey
Z1E was back ordered.
Larry C did the head
This email address is being protected from spambots. You need JavaScript enabled to view it., I can't say enough good about the guy, a true professional that does beautiful work, he has been a huge help with tips on assembly and start up procedures,
And now he is working on a fresh valve to replace the one I bent trying to change the shim using the bat wing.
I bought a NOS o ring off of ebay but it came all bent and twisted out of shape and would not sit in the groove so I decided to use the one that came with the Vesrah top end kit , I added a little Ultra black RTV in the groove first and when I took the head back off the o-ring is still in place and looks good.
I went with the 77 jugs that only had around 30,000 miles on them and measured out much better then the 78 with close to 70,000 on it.
I did my own honing with a 320sc ball hone using a big drill running at 450rpm and did 40 - 1 second reps per cylinder and I am very pleased with the results, sorry no good pics with my shitty phone/camera.
I even shaved 3.7 grams off of the inside of # 3 piston, now they are all within 0.2grams of each other, close enough.
Not much left to do