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Both Motown 220 heads offer a rather large 220 cc intake port volume combined with 2.055/ 1.600-inch Manley stainless steel valves. However, our measurements also found the aluminum heads are slightly bigger at 224 cc and the irons tested 217 cc.
Iron vs. Alloy

 Both Motown 220 heads offer a rather large 220 cc intake port volume combined with 2.055/ 1.600-inch Manley stainless steel valves. However, our measurements also found the aluminum heads are slightly bigger at 224 cc and the irons tested 217 cc.  View Related Article

 

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