PostScript Picture
(A 5021 FIR ORDER ART)
Distributor rotates counterclockwise.
Figure 2
Firing Order 1-3-7-2-6-5-4-8
351-M/400 c.i.d. Ford V8
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.
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 jour-
nals. If the engine is run after this happens, the bottom of the lifters
and the sides of the lobes will become chipped.
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
0.100").
2.
Rocker arm stud slot clearance (both ends; valve closed and open).
3.
Proper valve spring installed height settings (1.820" intake and
exhaust for Edelbrock Sure Seat springs #5872; 1.820" intake and
1.680" exhaust for Edelbrock Sure Seat springs #5972)
.
SPECIAL INSTRUCTION:
With the Edelbrock manifold and camshaft package plus a header
installation, a carburetor jet change may be required for best per-
formance. Due to the varied applications of year and model of vehi-
cles, no one combination could suffice for all installations. The fol-
lowing procedure is only a guideline and in many cases, the manu-
facturing specifications for recommended carburetors or timing
may be best.
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). Stock jetting can be used for most installa-
tions, however, various conditions may require re-calibration for
optimum performance (changes in altitude, temperature, exhaust
system , etc.). Refer to the Edelbrock Performer Series carburetor
Owner's Manual for calibration procedures. 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 applica-
tion must be determined by trial and error using the above informa-
tion as a guideline.
VACUUM ADVANCE:
For best cruise and light throttle response, a vacuum advance curve
was used with 24° to 28° maximum advance at 10-11 inches of
vacuum and 6° to 8° advance at 3-4 inches of vacuum.
HEADERS:
For best performance, headers are recommended with 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 applica-
tion must be determined by trial and error using the above informa-
tion as a guideline.
PostScript Picture
(timing chain art)
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
Page 3
Brochure #63-0082
© 2002 Edelbrock Corporation
Rev. 03/02
