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Ultimate Diesel Builder's Guide - - Horse Power -

Once you get the ports sized the way you want, you smooth them with the 80- or 100-grit rolls. You don't need or want a mir­ror fin­ish... even though that is "purty." A slightly rough sur­face is ac­tu­ally ben­e­fi­cial, as it cre­ates a thin bound­ary layer of tur­bu­lence that re­duces air fric­tion of the main flow run­ning more to­wards the cen­ter of the port. The dim­ples on a golf ball do the same thing.

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