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it refers to the eyebrows added to the cylinder heads to make the fuel swirl in the cumbustion chamber, better fuel effiency and added power.
 
Ah!, so everything old is new again as the old song title indicates.

From the link below: Somender Singh's Design to Improve Turbulence in Combustion Chambers by Creating a Vortex

I have read about Singh's work for several years now and he advocates for one to cut the grooves themselves in a test engine. No special tools required.
Singh Combustion Chamber Turbulence
 

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