Port timing
Compression
Skipping 85---
86 had the highest port timing and compression.
89-04 was next best
87 was next best
89-04 was next best
88 was the worst
86-88 are the easiest to port and can all be made to scream.
89-04 can also be made to scream but it takes a bit more effort.
With my new valve design I'm hoping to make some significant improvements on the 89-04 but time and dyno testing will need to be done.
Mechanically I have it operational... Took me three attempts (welding and hand machining) to get what I wanted.
I'm sending my cylinder away next week to get it bored and machined..
I'm also sending in my crank to get it rebuilt.
So I should have something to test in about a month or so...
I hate sending my cylinder off to the competition because they will see what I am doing
But they will only get half the story without the valves
I won't say who it is going to either cause I really like the guy but we don't share everything