Prior to installation, it is mandatory that valve-to-valve clearance is checked to determine if these heads are compatible with the camshaft you intend to run. Actual valve-to-piston clearance should be specified by your camshaft manufacturer. The use of aftermarket pistons (such as Edelbrock/JE pistons) and/or custom machining to your pistons is required. These heads have larger-than-stock valve sizes and will not work with the valve pockets in stock pistons. Prior to installation, it is mandatory that valve-to-piston clearances are checked and corrected to minimum specs, if necessary. IMPORTANT NOTES BEFORE BEGINNING INSTALLATION It is highly recommended that the installation of Performer RPM Twin Cam cylinder heads be performed by a qualified engine builder with experience in high performance or racing modifications to HarleyDavidson® engines. Length Stock Using 72cc Heads Stock Using 88cc HeadsĬarbureted Applications Spigot S & S “G”, Mount 48mm Mikuni #3121 #3122 #1781 #1782Įlectronic Fuel Injection Applications NOTE: All Edelbrock 95” Twin Cam ® Electronic Fuel Injection Power Packages Use Intake Manifold #1768 INTAKE MANIFOLD APPLICATION CHART - PERFORMER RPM TWIN CAM HEADSĬyl. It was designed to create a mismatch between the exhaust pipe and the exit which reduces power robbing exhaust gas reversion. The “D” shaped exhaust port provides a larger area for increased flow. When used with the listed engine sizes and head gasket thickness recommended (.045"), nominal compression is raised to 9.5:1 on the stock bore 88 cid engine and 10.25:1 on “big-bore” 95 cid engine. The dual-quench combustion chamber features a revolutionary new design that directs the air/fuel mixture into a tumbling and swirling motion for a better mix and more efficient combustion. Edelbrock intake manifolds must be used with these heads because of the unique port shape (see application chart below). 125" raised rectangular intake port also helps to increase the velocity of the incoming air for more power. These heads feature a rectangular shaped intake port for a noticeable increase in air flow. Matching Edelbrock/JE forged pistons are recommended for higher performance applications. This chamber size will produce a 9.5:1 compression ratio with 88 cid and 10.25:1 compression ratio with a 95 cid with flat top piston. Performer RPM Twin Cam CNC-ported heads have a 72cc combustion chamber. They are cast out of 356 aluminum and heat treated to T-6 specs. valve springs, teflon valve stem seals, titanium retainers, locks, and a three-angle valve job. Performer RPM Twin Cam CNC-ported heads come with high-grade, stainless steel, swirl-polished valves (1.940" intake and 1.625" exhaust) ductile iron seats and guides, 1.460" O.D. Patent #5,671,709 and #5,598,820), along with this CNC-porting, work together to provide more efficient combustion and awesome horsepower. The patented design of Edelbrock cylinder heads (U.S. These heads are completely CNC-ported in all critical areas…combustion chamber, intake port and exhaust port. They provide superior flow for maximum horsepower and torque. ĭESCRIPTION: Performer RPM Twin Cam CNC-ported aluminum heads are the ultimate heads for high performance power in 88-inch and larger Twin Cam 88 engines.If you have any questions or problems, do not hesitate to call our Technical Hotline at: 1-80, or e-mail us at PERFORMER RPM TWIN CAM® CNC-MACHINED CYLINDER HEADS FOR FUEL-INJECTED & CARBURETED TWIN CAM® ENGINES Catalog #1694, #1697 (88cc) Catalog #3020, #3024, #3049, #3080, 3187, 3188 (72cc) INSTALLATION INSTRUCTIONS PLEASE study these instructions carefully before beginning this installation.
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