Designed for 1968-87 429/460 Fords, these new Performer RPM heads are ideal for high-performance street, drag racing and marine applications. They are capable of 500+ hp at 6500 rpm (+30 hp more than ported factory heads) and 525+ ft/lbs. of torque at 4500 rpm with the Performer RPM Total Power Package. The Performer RPM heads with 75cc combustion chambers are ideal for use on 1968-71 engines originally equipped with 72-76cc heads. This head matches with Edelbrock Performer #350-2166 or Performer RPM #350-7166 for a proven combination. They accept all factory accessories as well as factory exhaust, aftermarket headers and factory valvetrain components. Requires the use of 3/8' diameter pushrods.