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Return to Parts List Category : D- Big Block (Low Deck) : Cylinder Heads : Aluminum : Edelbrock RPM EDE 60829-SCP CNC SUPER PREP WORK-EDE 60829 HEADS / PR HEADS NOT INCLUDED, SEE BELOW FOR DETAILS $613.75 This operation does not include cylinder heads.  EDE 60825 <- add two of these to your cart! This part number includes "CNC Super Prepping" of a pair of new Edelbrock RPM heads. The CNC /Super Prepped head work includes our proprietary racing valve job and seat grind that. improves valve and seat sealing and airflow. A deep port match is done to blend the intake and exhaust ports better. The intake stem heights are equalized and the exhaust valve stem heights are equalized. On top of all of that we perform C.N.C. combustion chamber work that is specifically designed to increase air-flow by un-shrouding the valve.  This chamber work opens up the chamber by approximately 8cc. If you need them milled back to original or a certain cc, let us know and we can quote you a price. This level of head can support up to 627HP. After porting, valve seats are finish machined with a multi-angle valve job. Light-weight aluminum castings (approximately 29.0lbs each, assembled) Accepts standard "B/RB" intakes and exhaust headers (factory exhaust manifolds may require modifications) Adjustable rocker arms must be used with cams having greater than stock valve lift. We recommend Hughes Engines adjustable rocker arm assemblies, along with matching pushrods. See puhrod length checking tools in related items. Closed chamber heads are approximately 75cc stock and 83cc after porting If you need a combination not shown here please call Valve springs, retainers, locks and seals are the stock Edelbrock parts Click on link below to see photos of Factory HP Exhaust manifolds mounted to these heads. #10----- HP Manifolds & Hooker Super Comp Headers on Big Block Angle Plug Heads To view the flow chart for this head click the button below.