Now i modified the head of the motor.
I would build in 29mm/32mm valves with 6mm stem in place of the 28/32mm original valves with 8mm stem. In addition i mill the valve seats to the max for much intake/exhaust flow.
I turn my own valve guides, from CW713R, because theres no guides with 6mm inside and 12,06mm outside on the market. Besides i smoothed the ports and makes the radius as great as possible. So i could realise a 25% better cfm rating.
The intake manifold merge to the head and i install the big throttle from the 75PS GT Engine.
And for better comparability i make a dyno-test with the original Engine:
http://network.perfexpert-app.com/results/WsfkuKAXrW