PERFORMER-LINK TIMING CHAIN & GEARS
CATALOG # 7800 SERIES
INSTALLATION INSTRUCTIONS
• 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, PST.
• 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 NOTinstall 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.
• SPECIAL INSTRUCTIONS FOR #7820
For 1962–’64 vehicles discard original spacer and thrust plate and use
Ford thrust plate #C90Z-6269-A.
For 1965–’72-1/2 vehicles use existing thrust plate.
For 1972-1/2–’84 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.
• USE A SLEEVE for
installations that require
hammering (see
Figure 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.
Misalignment can cause
chain to break (see
Figure 2).
• 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 block thoroughly before assembling.
Figure 2 - Check alignment of chain to ensure
that both sprockets are correctly installed
YES
Figure 1 - Use a sleeve to
install press-fit sprockets
Camshaft
YES
Crankshaft
NO
BlockBlock
NO
Camshaft
Crankshaft
© 2000 Edelbrock Corp. Rev. 8/00
• TIMING MARK ALIGNMENT
NOTE:Alignment of the timing marks as shown below does not
always indicate Top Dead Center (TDC) of the number 1 cylinder on
the compression stroke. Many engine families (Chevrolet, Pontiac,
etc.) will be at TDC of number 1 on the exhaust stroke and the
crankshaft will have to be rotated one full turn before the distributor
can be installed and timed.If you are installing a new camshaft, the
crankshaft will have to be rotated anyway to adjust the lifter pre-load
for all cylinders.TDC of number 1 (compression) can be determined
by observing that both intake and exhaust valves are closed, or, with
the spark plugs removed, by feeling compression buildup with your
finger as you rotate the crankshaft towards TDC.TDC will be indicated
by the timing marks on the harmonic balancer.
1. Keyway marked with ● or 0 (zero) is for standard
“straight-up”timing.
2. Keyway marked with ▲ or A is to advance cam timing 4°.
3. Keyway marked with ■ or R is to retard cam timing 4°.
NOTE:It is advisable
to use a ruler or other
straight-edge to help
determine that the
timing marks are
properly lined up on
the centerline between
the crank and the cam.
“Eyeballing it” can lead
to timing errors.
Timing
Marks
This line indicates proper timing
mark alignment (see arrows)
Figure 3
Standard
Figure 6
Standard
Figure 4
4° Advance
Figures 3-4-5 are typical of Ford V8 chain alignment.
Figure 7
4° Advance
Figures 6-7-8 are typical of Chevrolet, Chrysler and AMC V8 chain alignment.
Edelbrock Corporation
2700 California Street
Toll-Free Tech Line:1-800-416-8628
Tech email: edelbrock@edelbrock.com
Torrance, CA 90503
Figure 5
4° Retard
Figure 8
4° Retard
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