The first picture is of a standard head. All others are modified
This cylinder head took
Nigel marshals 748R from 104hp to 119hp and Chrisi Balls 853R to 133hp with only a 45mm
exhaust system. This porting is well beyond a cleaning of the ports,
this is a totally re-shaped head which has taken years worth of testing
to perfect. The new improved port and valve seat shape is very
unlike the original.
Balls 853R on our Customer Projects Page.