•
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 prop-
er operating clearances, especially when high performance compo-
nents are used. Things to look for that can cause failure and dam-
aged 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 INSTRUCTION
With the Edelbrock manifold and camshaft package plus a header
installation, a carburetor jet change may be required for best perfor-
mance. 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.
•
VACUUM ADVANCE
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.
•
CARBURETION AND IGNITION TIMING
Best carburetor results were with the Edelbrock Performer Series
carburetors #1405 (600 cfm with manual choke), #1406 (600 cfm
with electric choke), or #1407 (750 cfm with manual choke).
Engines equipped with Performer 460 (EGR) manifold #3766
should use original equipment carburetor. Stock jetting can be
used for most installations, however, various conditions may
require re-calibration for optimum performance (changes in alti-
tude, temperature, exhaust system , etc.). Ignition timing for this
package may vary with each application. A good starting figure
would be between 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 com-
bined and should be at full advance at 3000-3500 rpm. After tim-
ing 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 with the
Performer package. For this application, they should be 1-3/4"
diameter, approximately 31" long and terminating into a 3" col-
lector. 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 applica-
tion must be determined by trial and error using the above infor-
mation as a guideline.
Use of a straight edge to help
align the two timing marks is
highly recommended
Timing
Marks
Figure 1
Timing Chain Sprocket Alignment
Timing Marks
Figure 2
Firing Order 1-5-4-2-6-3-7-8
429/460 c.i.d. Ford V8
Turn distributor clockwise to advance timing.
©2008 Edelbrock Corp.
Rev. 9/08 - AJ/mc
Brochure #63-2167
