Edelbrock 7122 Automobile Parts User Manual


 
• CAMSHAFT/LIFTER RUN-IN
CAUTION: Change the engine oil and filter before start-up and
again after the initial break-in. Do not allow the engine to run
under 2000 rpm for the first 1/2 hour. Vary engine speed
between 2000 and 3000 rpm. Slow idle speeds may result in
severe cam and lifter wear.
1. Start the engine and bring to break-in rpm.
IMPORTANT INSTRUCTIONS AFFECTING YOUR WAR-
RANTY
• CAM LOBE WEAR- Cam lobe wear is almost non-existent
unless mismatched parts are used or installation of the cam and
lifters is done improperly. Most cam damage is caused by the
timing gear coming loose due to improper torque on bolt. Bolts
holding gear to camshaft should be torqued carefully and a lock-
ing compound applied to threads of bolts.
CAM GEARS AND CAMSHAFT END PLAY- If cam gear
becomes loose, the cam will slide back in the block, causing the
lifters to hit the lobes next to them and also the cam bearing
journals. If the engine is run after this happens, the bottom of
the lifters and the sides of the lobes will become clipped.
When installing a camshaft, it is always important to check for
proper operating clearances, especially when high performance
components are used. Things to look for that can cause failure
and damaged parts are as follows:
1. Improper valve-to-piston clearance (this should be no less than
0.080").
2. Rocker arm stud slot clearance (both ends; valve closed and
open).
3. Proper spring settings (see dimensions with spring instruction
sheet; correct dimensions mean maximum performance and
longer engine life).
• SPECIAL INSTRUCTIONS
With the Edelbrock manifold and camshaft package plus a head-
er installation, a carburetor jet change may be required for best
performance. Due to the varied applications of year and model
of vehicles, no one combination could suffice for all installa-
tions. The following procedure is only a guideline and in many
cases, the manufacturing specifications for recommended carbu-
retors or timing may be best.
• IGNITION TIMING
Ignition timing for this package may vary with each application.
A good starting figure would be between 10 degrees to 14
degrees initial timing at idle with vacuum advance disconnected.
Total advance should not exceed 32 degrees to 34 degrees with
initial and centrifugal weights combined and should be at full
advance at 3000-3500 rpm. After timing is adjusted, re-connect
the vacuum advance line. NOTE: The best combination for any
particular vehicle or application must be determined by trial and
error using the above information as a guideline.
• HEADERS
For best performance, headers are recommended. For this appli-
cation, they should be 1-5/8" or 1-3/4" diameter, approximately
31" long and terminating into a 3" collector. The remainder of
the exhaust system should consist of dual exhaust and tail pipes,
at least 2" diameter with low back-pressure mufflers.
• WARNING
In order for this Performer RPM cam and lifter kit to be covered
under ANY WARRANTY you MUST use the correct Edelbrock
Sure Seat Valve Springs. The end flap or label from your Sure
Seat Valve Spring box must be sent in with your camshaft war-
ranty card.
Failure to install new Edelbrock Sure Seat Valve Springs with
your new Performer RPM cam and lifter kit could cause the cam
lobes to wear excessively and could cause additional engine
damage. IF YOU HAVE ANY QUESTIONS ABOUT THIS
APPLICATION, PLEASE CONTACT OUR TECHNICAL
DEPARTMENT IMMEDIATELY.
• PLEASE complete and mail your warranty card. Be sure to
write the model number of this product in the “Part #____”
space.
THANK YOU.
page 3
• CAUTION: Use Edelbrock Performer-Plus Timing Chain and
Gear Set #7811/#7820 or Accu-Drive gear drive #7892. Do not
use late model timing chain and gear sets that are designed for
emission-controlled engines. These timing sets are machined in
a retarded position and are not recommended for this camshaft
installation. Edelbrock Timing Sets feature three keyways for
specific timing selection.
Timing Chain
Sprocket Alignment
Figure 2
Firing Order 1-5-4-2-6-3-7-8
289-302 c.i.d. Ford V8
Turn distributor clockwise to advance timing.
NOTE: 5.0 Litre H.O. engines originally have a different
firing order. This must be changed to the firing order listed
above when installing Performer RPM camshaft #7122.
Figure 1
Timing Marks