Does any one know if these are good castings? they have steam holes. but are they like the 487 in flow numbers since they have both numbers. and will they work on a mild 11 to1 motor or should valve size be up graded Thank's Kirk
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Does any one know if these are good castings? they have steam holes. but are they like the 487 in flow numbers since they have both numbers. and will they work on a mild 11 to1 motor or should valve size be up graded Thank's Kirk