Owners manual

© 2004 Edelbrock Corp. Catalog # 7800 Series Timing Chains
Rev. 12/04 Page 1 of 6 Brochure #63-0128
PERFORMER-LINK TIMING CHAIN & GEARS
CATALOG # 7800 SERIES
INSTALLATION INSTRUCTIONS
• TIMING CHAIN AND GEAR KEYWAYS:
The Edelbrock crankshaft sprocket is
manufactured with three keyways (except
street legal sets #7802, #7809, and
#7814). Each keyway is marked with a
geometrical symbol indicating a standard
straight-up or zero (● or “0”), advanced
(▲ or “A”), or retarded (■ or “R”)
camshaft position (See Figures 3 through
8, showing each installed position). In
many cases, being able to retard or
advance a camshaft enables you to be more exact when installing a
camshaft for a specific application. Advancing or retarding a camshaft
can shift the power range to a lower or higher RPM. Advancing a camshaft
will move the torque to a lower RPM, while retarding a camshaft will move
the torque to a higher RPM. For persons not familiar with camshaft
function, we suggest the standard installation position.
NOTE: If the timing symbol on your stock crankshaft sprocket is in line
with the keyway, use Figures 3,4, or 5 when installing your Edelbrock
timing chain and gears. If the timing symbol on your stock crankshaft
sprocket is not in line with the keyway, use Figures 6,7, or 8 when
installing your Edelbrock timing chain and gears.
CAUTION: Edelbrock Performer-Plus camshafts have been engineered
and ground to produce optimum performance when installed in the
straight-up zero position only. DO NOT install a Performer-Plus or
Performer-RPM camshaft in an advanced or a retarded position. When
using Performer-Link Timing Chain and Gears (7800 Series) with
Edelbrock cam and lifter kits, straight-up timing alignment is achieved. If
any other timing gear set is used, it is necessary to check camshaft
position for correct timing alignment. This requires indexing the camshaft
with a degree wheel to verify timing alignment. OEM or non-Edelbrock
timing timing gear sets are not recommended for use with Edelbrock
camshafts.
• Performer roller chain sets are engineered to operate up to 6500 rpm.
• Never hammer directly on chain or sprockets. You can crack the
hardened links and pins and cause early failures.
• USE A SLEEVE for installations that require hammering (see Fig. 1).
A brass drift punch may be used if you carefully alternate blows on either
side of the sprocket to avoid cocking.
• Never stretch the chain with a screwdriver.
• Check for clearance between the timing chain and block and between the
chain and front cover before reassembly.
• Be sure that both cam and crank sprockets are exactly in line with each
other. Misalignment can cause chain to break (see Figure. 2).
• SPECIAL INSTRUCTIONS
FOR #7820
For 1962–’64 vehicles,
discard original spacer
and thrust plate and use
Ford thrust plate #C90Z-
6269-A.
For 1965 to 1972-1/2
vehicles, use existing
thrust plate.
For 1972-1/2 to 1984
vehicles, discard original
2-piece eccentric and use
1-piece eccentric Ford
#C3AZ-6287-B (original
2-piece eccentric may be
used with #7811). Use
existing thrust plate.
All years: Do not re-
install original oil
slinger.
• SPECIAL INSTRUCTIONS
FOR #7800 S/B Chevy
On some late model
engine blocks, it will be
necessary to check
clearance behind cam
gear (with chain on gear)
and engine block at 12
o’clock position (see
photo on the right). Make
sure that the chain clears
oil galley bosses on block
with chain and sprocket in
the rearward most
position. Grind or machine
block for clearance, if
necessary. Clean the
ablock thoroughly before
assembling.
Figure 1 - Use a sleeve to
install press-fit sprockets
Figure 2 - Check alignment of chain
to ensure that both sprockets are
correctly installed
YES
NO
Camshaft
Camshaft
BlockBlock
Crankshaft
Crankshaft
YES
NO
®
• PLEASE READ THE FOLLOWING INSTRUCTIONS CAREFULLY FROM BEGINNING TO END BEFORE INSTALLING YOUR TIMING CHAIN.
Check the listing on the box back or the Edelbrock catalog to be sure that you have the correct part number for your application. True Rolling timing
chain and gear sets are products of quality material and workmanship. They offer the ultimate in durability, performance, and low friction operation.
NOTE: For timing chain and gear installation, we suggest that you check the manufacturer’s service manual or Motors, Chilton’s, or Mitchell for
correct installation procedure pertaining to your type, year, and model vehicle. The main cause of timing chain and camshaft installation problems
is failure to apply the proper torque to the camshaft sprocket bolts. The correct torque value is given in the service manual, and we highly
recommend the use of a thread-locking compound such as Loc-tite™ or equivalent. If you have any questions, please contact us at our Technical
Hotline at 1-800-416-8628, 7:00am-5:00pm, Monday through Friday, Pacific Standard Time or e-mail us at [e-mail].
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