Quote:
Originally Posted by spuggy
For example; if removing a large casting cack or lip is good, then so would be polishing the ports, right?
Not necessarily; turbulence can result in better fuel atomization/mixing - and thus better power, economy, response - than mirror-polished.
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I had the heads on both my M900 and 916 ported by Chris at CJS Racing in Bristol, both make very good power.
But (generalising) the intake ports have a 'rough' finish whilst the exhaust ports are smoother. My understanding is that this for turbulence for the intake and less resistance for the exhaust...