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When the valve diameter is big, and has a long stem. Like the B1 M/C stuff its a almost a must.
But for most engines turning below 8K with a moderate valve size. You wasting money IMO



I'm Using B-1 MCs on a 572, single 4, Probably will be under 8000. Maybe 7200 to 7600 peak don't know what peak will be till its dynoed. Is it worth it to do the Exhaust Valves on the B-1 MCs?