technical question about combustion chamber

Dave Chudak /
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My question is,

Are these rough spots in the combustion chamber necessary(shown in the picture) ? i would think that they would negatively effect performance, but don't want to file them down, until i find out why it is like that in the first place.

is it rough for a reason? aggitate air inside chamber for a better mix maybe? i dunno... i just don't want to file them off, and find out that they are important..

thanks

1082667130_roughspots.jpg
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