Edelbrock Automobile Parts 1604 User Manual

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 [email protected]. 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  
Flange Intake  
#1671  
3-Piece  
Spigot Intake  
#1670  
3-Piece S&S  
“G” Intake  
#1669  
Cyl. Length  
stock (80")  
stock  
S&S Kit  
--  
89"  
93"  
#1671  
#1676  
#1670  
#1677  
#1669  
#1683  
-.050"  
-.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  
Catalog #1604, 1606, 1607, 1624, 16041 & 16061  
Rev. 3/07 - RS/mc  
©2007 Edelbrock Corporation  
Brochure #63-1604  
1 of 6  
 
7. Remove the remaining fasteners (12, 13 and 14) holding the lower  
rocker arm cover (17) to the cylinder head (See Figure 1).  
8. Remove the lower rocker cover and gaskets (15 and 16).  
9. See Figure 4. Loosen each head bolt (1, 2) 1/8 turn following the  
cross pattern sequence shown in Figure 9  
1. Push rod (2)  
2. Spring cap retainer (2)  
3. Upper push rod cover (2)  
4. Spring cap (2)  
5. Spring (2)  
6. Spacer (2)  
7. O-ring (2)  
8. Lower push rod cover (2)  
9. O-ring (2)  
CAUTION  
Loosen head bolts gradually, in a cross pattern, to  
prevent distorting the head, cylinder and crankcase  
studs.  
10. Spacer (2)  
11. O-ring (2)  
12. Tappet (2)  
13. Bolt (4)  
14. Lifter guide (2)  
d15. Gasket (2)  
10. Continue loosening in 1/8 turn increments until bolts are loose.  
11. Remove bolts.  
12. Remove cylinder head and head gasket.  
13. Repeat steps 1 through 14 for the other head.  
NOTE: It may be necessary to raise or lower engine in frame  
for clearance. Use small jack under engine.  
Figure 2 - Pushrod and Cover Assembly  
REMOVE ROCKER ARM COVERS  
1. Remove bolts (1) and seals (2) (See Figure 1). Use a shortened  
3/16" allen wrench.  
2. Remove top (3) and middle (4) sections of rocker box. Remove  
gaskets (5, 6, and 7) and discard.  
3. Rotate the engine so both valves are closed on the head being  
removed.  
4. Remove the rocker arm retaining bolts (11) and washers nearest the  
rocker arm shafts at the push rod end.  
NOTE: Remove lower rocker boxes as an assembly then  
disassemble if necessary.  
5. Remove the push rods (1) and mark their location and orientation,  
top and bottom (See Figure 2).  
6. Remove spring cap retainers (2) on push rod covers and remove  
push rod covers and associated parts (3 through 11) (See Figures  
2 & 3).  
CAUTION  
All valve train components must be reinstalled in their  
original positions. Remove Spring Cap Retainers.  
Figure 4 - Cylinder Head and Cylinder  
1. Head bolt, long (2)  
2. Head bolt, short (2)  
3. Cylinder head gasket  
4. Inner valve spring (2)  
5. Outer valve spring (2)  
6. Valve keeper (4)  
10. Valve stem seal (2)  
11. Cylinder stud (4)  
12. Cylinder base gasket  
13. O-ring and insert (2)  
14. Valve guide (2)  
15. Valve seat (2)  
7. Upper collar (2)  
8. Lower collar (2)  
16. Cylinder head (2)  
17. Cylinder (2)  
9. Valve (1) intake, (1) exhaust  
18. Piston  
Figure 3 - Removing Spring Cap Retainers  
Catalog #1604, 1606, 1607, 1624, 16041 & 16061  
Rev. 3/07 - RS/mc  
©2007 Edelbrock Corporation  
Brochure #63-1604  
3 of 6  
 
INSTALLATION PROCEDURE  
HEAD GASKETS  
You must use the correct head gaskets to achieve a 9.5:1  
compression ratio for best power. Thicker gaskets will lower  
compression and power, and thinner gaskets will raise compression  
higher than advisable for use with today's unleaded pump gasoline.  
1. Use Edelbrock gasket set #1640 for 1984-91 or #1641 for  
1992 and later engines. This set includes the proper thickness  
head gaskets (.045") and the special intake manifold gaskets  
required for these cylinder heads.  
2. You may use standard Harley-Davidson® head gaskets, if desired.  
They vary in thickness, so it is advisable to measure your gasket  
before use (See Figure 5). Recommended thickness is .045".  
Figure 6 - Cleaning Gasket Surfaces  
CAUTION  
If you use copper head gaskets, be aware that they  
must be properly annealed prior to installation. Even  
if gaskets were annealed when new, copper can re-  
harden during storage. Failure to anneal before  
installation may lead to head gasket failure.  
Figure 7 - Cylinder O-Rings and Inserts  
Figure 5 - Measuring Cylinder Head Gasket  
CYLINDER HEAD INSTALLATION  
1
2
3
Front cylinder  
CAUTION  
4
Install new O-rings over the cylinder dowels before  
installing the head gasket. Install the O-rings first to  
ensure alignment of the head gasket and prevent  
gasket leaks.  
CAUTION  
Use only original equipment specification head bolts  
and other hardware. All original hardware is  
hardened grade 8 material, which is required for  
proper performance of these parts.  
4
Rear cylinder  
3
2
1
1. Be sure the gasket surfaces and stud holes are clean and dry (See  
Figure 6). Place new O-rings (13) on the cylinders and position the  
head gaskets on the inserts (13) (See Figure 7).  
2. Dip the head bolt threads and bottom face of bolt head in oil; then  
wipe off any excess. Install the head bolts (1 and 2, Figure 4) finger  
tight.  
Figure 8 - Cylinder Head Bolt Torque Sequence  
Catalog #1604, 1606, 1607, 1624, 16041 & 16061  
Rev. 3/07 - RS/mc  
©2007 Edelbrock Corporation  
Brochure #63-1604  
4 of 6  
 
3. Cylinder Head bolt torque sequence (See Figure 8):  
The procedure for tightening the head bolts is extremely critical; not  
only to prevent gasket leaks, but to prevent stud failure and heads  
and cylinders distortion.  
CAUTION  
Be sure you thoroughly clean and lubricate the  
cylinder head bolts before tightening to the correct  
torque. Friction because of dirt or grime will cause  
the torque wrench readings to be incorrect. Clean  
and lubricate the threads with engine oil and screw  
the bolts onto the crankcase studs by hand to be sure  
there is no friction.  
Figure 9 - Tightening 1986-1995 Head Bolts  
PUSH ROD INSTALLATION  
A. Cylinder Head Torque Sequence for 1984-85 Models  
CAUTION  
1. Rotate the engine so that both lifters of the cylinder being serviced  
are on the base circle (lowest position) of the camshaft.  
Use only original equipment head bolts and studs  
for your year vehicle to ensure proper torque and  
head gasket life.  
NOTE: When using an aftermarket performance camshaft,  
such as Performer RPM, which is dyno matched and  
recommended for use with Performer RPM Cylyinder Heads,  
you must use an adjustable pushrod kit such as Edelbrock  
#1737. Refer to the instructions provided with your pushrod  
kit for the proper valve adjustment procedure. Complete this  
adjustment procedure BEFORE performing the final pushrod  
installation.  
1. See Figure 8. With a torque wrench, start at the  
cylinder head bolt numbered "1" and tighten to 7-9  
ft./lbs. Then tighten "2", "3", and "4" in order to 7-9  
ft./lbs.  
2. Following the torque sequence, tighten each bolt to  
15-17 ft./lbs.  
3. Following the torque sequence, tighten each bolt to  
24-26 ft./lbs.  
2. Refer to Figure 1. Install push rod covers and associated parts,  
CAUTION  
using new O-rings. Install push rods.  
The cylinder head bolts are not to be checked  
for tightness after final torquing at reassembly  
is completed. Retightening the bolts to  
specified torque at regular intervals will place  
undue stress on bolts and bolt anchoring  
threads.  
NOTE: Be sure to use new O-rings on push rod tubes to  
prevent leaks. Also check carefully to be certain old O-rings  
were removed from push rod tubes and lifter bores.  
3. Install gaskets (15 and 16). Place lower rocker box assemblies (17;  
with rocker arms and shafts) in position.  
B. Cylinder Head Torque Sequence for 1986-95 Models  
NOTE: Rocker arm shafts are notched to accept the rocker  
arm retaining bolts. Align the notches with the bolt holes  
before installing the bolts (See Figure 10).  
CAUTION  
Use only original equipment head bolts and studs  
for your year vehicle to ensure proper torque and  
head gasket life.  
1. See Figure 8. With a torque wrench, start at the  
cylinder head bolt numbered "1" and tighten to 7-9  
ft./lbs. Then tighten "2", "3", and "4" in order to 7-9  
ft./lbs.  
2. Following the torque sequence, tighten each bolt to  
12-14 ft./lbs.  
3. See Figure 9. Mark a line on the cylinder head and  
a corresponding line on the head of the cylinder head  
bolt as shown in View A. Following the same  
sequence 1, 2, 3, then 4, turn each bolt, one at a time  
one quarter turn (90°) using the marks as a guide.  
When marks are all positioned, as in View B, the  
procedure is completed.  
Figure 10 - Rocker Arm Shaft Bolt Notches  
Catalog #1604, 1606, 1607, 1624, 16041 & 16061  
Rev. 3/07 - RS/mc  
©2007 Edelbrock Corporation  
5 of 6  
Brochure #63-1604  
 
4. Install bolts and washers (11 and 12, 13 and 14). Slowly snug lower  
rocker box fasteners in small increment (one at a time) in a cross  
pattern. This will bleed the lifters. Check carefully as you go to be  
certain push rods are still in their proper position in the rocker arm.  
Tighten the 5/16" bolts (11, 12) to 15-18 ft./lbs. and tighten the 1/4"  
bolts (13, 14) to 10-13 ft./lbs.  
5. Install the intake manifold according to the instructions provided  
with the intake manifold.  
6. Install the carburetor, V.O.E.S. and ignition components.  
7. Reassemble all components removed during disassembly, connect  
battery cables, and re-fuel gasoline tank.  
CAUTION  
8. To prevent discoloration when the engine reaches operating  
temperature, carefully wipe off grease, fingerprints, stains, etc.,  
from all chrome and polished surfaces with a lint-free cloth and  
alcohol, Windex, etc., before starting engine.  
Do not turn engine over until push rods spin freely.  
Damage could occur to valves.  
4. Install the middle (4) and top (3) rocker arm covers, using new  
gaskets and new fiber seals. The fiber seals must be under the steel  
washers. Be sure the middle cover section is spaced evenly on all  
sides before tightening the cover screws. Tighten the screws to 10-  
13 ft./lbs. following a crisscross pattern. If a torque wrench cannot  
be used, tighten securely by hand.  
Edelbrock Corporation • 2700 California St. • Torrance, CA 90503  
Tech-Line: 1-800-416-8628 • E-Mail: [email protected]  
The words Evolution, Harley and Harley-Davidson are registered trademarks of  
Edelbrock is a registered trademark of Edelbrock Corp, Torrance, CA, USA.  
Harley-Davidson, Inc., Milwaukee, Wisconsin, USA and are used in this  
instruction sheet for reference only.  
Catalog #1604, 1606, 1607, 1624, 16041 & 16061  
Rev. 3/07 - RS/mc  
©2007 Edelbrock Corporation  
Brochure #63-1604  
6 of 6  
 

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