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Im currently running a set of steel world products sportsman 23 degree that has mild bowl port work done on them they were 72cc combustion chamber then last year I had them milled 30 thousands. I also have a set of aluminum brownfields the guy I bought them from said ther like the afr 227 this true? I know nothing about the aluminum heads besides are not cracked I'm wonderin what is the better set to use. Thanks for any info is appreciated