Edelbrock Later Harley-Davidson 1604 Installation Instructions Manual

PLEASE study these instructions carefully before beginning this installation. Most installations can be accomplished with common tools and
procedures. However, you should be familiar with and comfortable working on your vehicle. If you do not feel comfortable performing this installation,
it is recommended to have the installation completed by a qualified mechanic. If you have any questions, please call our Technical Hotline at:
1-800-416-8628, 7:00 am - 5:00 pm, Pacific Standard Time, Monday through Friday or e-mail us at Edelbrock@Edelbrock.com. If your question
is motorcycle carburetor-related, please call our Edelbrock Motorcycle Carburetor division at 1-877-888-7504, Ext. 2.
IMPORTANT NOTE: Proper installation is the responsibility of the installer. Improper installation
will void your warranty and may result in poor performance and engine or vehicle damage.
DESCRIPTION: The Edelbrock Performer RPM™ Cylinder Heads are designed to provide increased performance in the idle to 6000+ RPM range, in
1984 and later, 80-inch and larger, Evo Big Twin engines. They feature a CNC-machined, rectangular intake port to provide a noticeable increase in
air flow. The intake port is also raised .125" to help increase the velocity of the incoming air for more power. Edelbrock intake manifolds must
be used with these heads due to the unique port shape (see application chart below). The dual-quench combustion chamber features a
revolutionary new design that promotes a better mix and more efficient combustion. The CNC-machined, "D" shaped exhaust port provides a larger
area for increased flow, and is designed to create a mis-match between the exhaust pipe and the exit to reduce power-robbing exhaust reversion.
Performer RPM™ heads #1604, 1606, 1607, 1624, 16041, & 16061 fit 1984 and later Evolution
are assembled with stainless steel valves (1.940" intake and 1.625" exhaust), ductile iron valve seats and guides, 1.460" O.D. heavy-duty valve
springs, teflon valve stem seals, and machined valve spring retainers and locks. The increased valve sizes require the use of aftermarket or modified
pistons. In 80-inch Evo engines, we recommend using Edelbrock/JE Sportsman Pistons, which match the uniquely shaped combustion chambers of
the Performer RPM cylinder heads. Other engine sizes require modified stock, or other aftermarket pistons.
IMPORTANT NOTES BEFORE BEGINNING INSTALLATION
• It is recommended that the installation of Performer RPM cylinder heads be performed by a qualified engine builder with experience in high
performance or racing modifications to Harley-Davidson
• If you are using any cam other Edelbrock Performer RPM cam #1740, it is mandatory that valve-to-valve clearance is checked to
determine if these heads are compatible with the camshaft you intend to run. See Page 2.
Catalog #1604, 1606, 1607, 1624, 16041 & 16061
Rev. 3/07 - RS/mc
INTAKE MANIFOLD APPLICATION CHART - Performer™ Cylinder Heads
Cyl. Length S&S Kit
stock (80") --
stock 89"
-.050" 93"
-.175" 88"
+.015" 96"
+.075" 98"
The following replacement items are available separately:
Exhaust Seat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .#1643
Intake Seat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .#1644
Exhaust Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .#1645
Intake Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .#1646
Exhaust Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .#1647
Intake Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .#1648
PERFORMER RPM™ CNC MACHINED CYLINDER HEADS
Catalog #1604, 1606, 1607, 1624, 16041 & 16061
3-Piece 3-Piece
Flange Intake Spigot Intake
#1671 #1670
#1671 #1670
#1676 #1677
#3031 #3030
#1671 #1670
#1674 #1675
® engines.
REPLACEMENT ITEMS
1 of 6
For 1984 & Later Harley-Davidson
Evolution ® "Big Twin" Engines

INSTALLATION INSTRUCTIONS

® "Big Twin" engines. Performer RPM™ cylinder heads
3-Piece S&S
"G" Intake
#1669
#1669
#1683
#3032
#1669
#1684
©2007 Edelbrock Corporation
®
Brochure #63-1604