Edelbrock 352-428 User Manual

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Timing
Marks

Figure 1

Timing Chain

Sprocket Alignment

Figure 2

Firing Order 1-5-4-2-6-3-7-8

352-428 c.i.d. Ford V8

Turn distributor clockwise to advance timing.

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.

•

CAUTION: Use Edelbrock Performer RPM Timing Chain

and Gear Set #7808. 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. Use the "0" position for most applications.

•

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 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 with 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

Best carburetor results were with the Edelbrock Performer

Series carburetors #1407 (750 cfm with manual 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.). Ignition timing for this package may vary with

each application. A good starting figure would be between 12

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.

•

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.

•

HEADERS

For best performance, headers are recommended with the

Performer rpm package. For this application, they should be

2" diameter, approximately 31" long and terminating into a

3-1/2" collector. The remainder of the exhaust system should

consist of dual exhaust and tail pipes, at least 2-1/2" diameter

with low back-pressure mufflers such as Edelbrock RPM

Series stainless steel 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 the model number of this product in the “Part #____”

space.

THANK YOU.

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