©2007 Edelbrock Corporation
Brochure #63-1604
1 of 6
Catalog #1604, 1606, 1607, 1624, 16041 & 16061
Rev. 3/07 - RS/mc
PERFORMER RPM™ CNC MACHINED CYLINDER HEADS
For 1984 & Later Harley-Davidson
®
Evolution
®
“Big Twin” Engines
Catalog #1604, 1606, 1607, 1624, 16041 & 16061
INSTALLATION INSTRUCTIONS
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
. 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
®
"Big Twin" engines. Performer RPM™ cylinder heads
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.
INTAKE MANIFOLD APPLICATION CHART - Performer™ Cylinder Heads
3-Piece
3-Piece
3-Piece S&S
Cyl. Length
S&S Kit
Flange Intake
Spigot Intake
“G” Intake
stock (80")
--
#1671
#1670
#1669
stock
89"
#1671
#1670
#1669
-.050"
93"
#1676
#1677
#1683
-.175"
88"
#3031
#3030
#3032
+.015"
96"
#1671
#1670
#1669
+.075"
98"
#1674
#1675
#1684
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
®
engines.
•
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.
REPLACEMENT ITEMS
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
