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pump eccentric Ford #C3AZ-6287-B. Accu-Drive gear drive #7892
may also be used. 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.
CAM GEARS AND CAMSHAFT END PLAY - If cam gear becomes
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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.
NOTE: When installing a camshaft, it is always important to check
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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.
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SPECIAL INSTRUCTION
CAUTION: Some models of early vehicles use a short pin in the
camshaft. For these vehicles, we suggest grinding the long pin in
the Edelbrock cam to the same length as the short pin, or remove
the stock pin and install it in the Edelbrock cam.
With the Edelbrock manifold and camshaft package plus a header
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 installations. The
following procedure is only a guideline and in many cases, the
manufacturing specifications for recommended carburetors or
timing may be best.
CARBURETION AND IGNITION TIMING
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Best carburetor results were with the Edelbrock Performer Series
carburetors #1404 (500 cfm), #1405 (600 cfm with manual choke),
or #1406 (600 cfm with electric choke). Stock jetting can be used
for most installations, however, various conditions may require re-
calibration for optimum performance (changes in altitude,
temperature, exhaust system , etc.).
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 34 degrees to 38 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. Installation of the Edelbrock Ignition
Computer will allow various ignition curves to be selected to match
changing conditions.
VACUUM ADVANCE
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For best cruise and light throttle response, a vacuum advance
curve was used with 16° to 20° maximum advance at 14-16
inches of vacuum and 4° to 10° advance at 10-12 inches of
vacuum.
©2005 Edelbrock Corporation
Rev. 3/05 - RS/mc
Ignition timing for this
Page 3 of 9
HEADERS - For best performance, headers are recommended with
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the Performer package. For this application, they should be 1-5/8"
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. NOTE: The best combination for any particular
vehicle or application must be determined by trial and error using
the above information as a guideline.
PLEASE complete and mail your warranty card. Be sure to write
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the model number of this product in the "Part #____" space.
THANK YOU.
Timing
Marks
Figure 1 - Timing Chain Sprocket Alignment.
Figure 2 - 289-302 c.i.d. Ford V8
Firing Order 1-5-4-2-6-3-7-8
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-Plus camshaft #2122.
Edelbrock Corporation • 2700 California St. • Torrance, CA 90503
Tech-Line: 800-416-8628
E-Mail: Edelbrock@Edelbrock.com
Catalog #2122
Brochure #63-0298
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