Ferrea Competition Plus Hollow Stem 2.020" Intake Valves (Set of 8) SB Chevy 11 32" Stem Diameter 4.960" Length V202001 #2957 accepts standard flange carburetors WEI7155 #2957 accepts standard flange carburetors and #2956 is for 4500 Series carbs Passenger Side Port Our engineering staff at Ferrea spends countless hours conducting flow bench tests to achieve an optimum balance of flow Competition Plus
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