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IMPORTANT INSTRUCTIONS AFFECTING
• 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 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 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.
• 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.
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.
©2009 Edelbrock Corp
Part # 7157
YOUR WARRANTY
• 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.
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 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 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
TECHNICAL DEPARTMENT IMMEDIATELY.
TIMING
MARKS
Figure 2- Timing Chain Sprocket Alignment
For this
Brochure #63-7157
Rev 5/09 - AJ/mc
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