©2006 Edelbrock Corporation
Brochure #63-1602
Page 1 of 6
Catalog #1602, 1615
Rev. 4/06 - RS/mc
PERFORMER™ CYLINDER HEADS
For 1984 & Later Harley-Davidson
®
Evolution
®
“Big Twin” Engines
Catalog #s 1602 & 1615
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.
PLEASE
complete and mail your warranty card. Be sure to write the model number of this product in the "Part #____" space.
THANK YOU
.
DESCRIPTION:
The Edelbrock Performer™ Cylinder Heads are designed for street high performance use, and are interchangeable with stock Harley-
Davidson
®
cylinder heads on the Evolution
®
“Big Twin” engines. Edelbrock Performer™ heads can be used with unmodified, stock pistons and the
stock valve train with cam lifts up to .580" for bolt-on performance. These heads make excellent power increases in the stock RPM range of the Harley-
Davidson
®
Big Twin
®
engine (idle to 5500 rpm).
Cam lifts higher than .580" or engine speeds higher than 5500 rpm will require different
valve springs and other valve train modifications - please consult a qualified performance mechanic
. These heads will work with bore
sizes up to 3-13/16" and feature a rectangular shaped intake port for a noticeable increase in air flow. This .125" raised rectangular intake port also
helps to 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 directs the air/fuel mixture
into a tumbling and swirling motion for a better mix and more efficient combustion. The 72cc combustion chamber increases the compression ratio
to 9.5:1 for more power. The “D” shaped exhaust port provides a larger area for increased flow, and was designed to create a mis-match between
the exhaust pipe and the exit which reduces power-robbing exhaust reversion. Performer™ heads fit 1984 and later Evolution
®
"Big Twin" engines.
They are machined with 1992 and later crankcase breather holes, and include block-off plugs for use on 1984-1991 engines. Performer™ cylinder
heads are assembled with stainless steel valves (1.850" intake and 1.610" 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. They are cast out of 356 aluminum and heat treated to T-6 specs.
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 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 than stock or Edelbrock Performer-Plus 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.
The words Evolution, Harley and Harley-Davidson are registered trademarks of
Harley-Davidson, Inc., Milwaukee, Wisconsin, USA and are used in this
instruction sheet for reference only.
Edelbrock is a registered trademark of Edelbrock Corp, Torrance, CA, USA.
