Cam swap and porting a KV6

Good morning all.

Has anyone much experience of porting the ZS 180, I know the valves cant go much bigger but how much can reasonably be taken off the ports before it starts to hinder head strength.



The inlet cams on a ZS 180 seem to be quite the terror also, Has anyone had any experience with swapping the inlet cams for another set of standard exhaust cams (Higher lift and slightly longer duration) and using verniers on the inlet side to time it right?

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