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Figure 1- Pontiac 389-455 c.i.d. V8
Firing Order 1-8-4-3-6-5-7-2
Turn distributor clockwise to advance timing.
• PLEASE complete and mail your warranty card. Be sure to write the model number of this product in the “Part #____” space.
• THANK YOU.
IMPORTANT INSTRUCTIONS AFFECTING
YOUR WARRANTY
• 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
locking 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 bear-
ing 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
header installation, a carburetor jet change may be required for
• CAMSHAFT/LIFTER RUN-IN
CAUTION: Change the engine oil and filter before start-up
and again after initial break-in. Do not allow the engine to run
under 2000 rpm for the first 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.
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 recom-
mended carburetors or timing may be best.
• IGNITION TIMING
Ignition timing for this package may vary with each applica-
tion. A good starting figure would be between 10 degrees to 14
degrees initial timing at idle with vacuum advance disconnect-
ed. 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 combina-
tion for any particular vehicle or application must be deter-
mined by trial and error using the above information as a
guideline.
• HEADERS
For best performance, headers are recommended. For this
application, they should be 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 cov-
ered 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 warranty 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 TECH-
NICAL DEPARTMENT IMMEDIATELY.
TIMING
MARKS
Figure 2- Timing Chain Sprocket Alignment
• CAUTION: Use Edelbrock Performer-Link Timing Chain and Gear Set #7812. 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.