Edelbrock 2103 - Manual (Page 3)

Figure 2— Timing Chain Sprocket Alignment
Timing
Marks Firing Order: 1-8-4-3-6-5-7-2
Figure 1
400 c.i.d Chevrolet V8
Firing Order and Timing Marks
Turn distributor counter clockwise to advance timing
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 hap-
pens, the bottom of the lifters and the sides of the lobes will become
chipped. TUBULAR EXHAUST SYSTEM—For best performance, a tubular exhaust
system is recommended with the Performer package to provide the most
low-end torque. Please consult your Edelbrock dealer or the Edelbrock
catalog for a listing of available Edelbrock
Tubular Exhaust Systems. Be
sure to check local emission control regulations for legality of camshaft
and exhaust system changes.
IMPORTANT NOTE: When using Performer-Link True Rolling timing chain
and gear sets (#7800 or #7802) with an Edelbrock cam and lifter kit,
straight up timing alignment is achieved. If any other timing gear set is
used, it is necessary to check camshaft position for correct timing align-
ment. This requires indexing the camshaft with a degree wheel to verify
timing alignment. O.E.M. or non-Edelbrock timing gear sets are not rec-
ommended for use with Edelbrock camshafts.
SPECIAL INSTRUCTIONS
With the Edelbrock manifold and camshaft package plus a header instal-
lation, a carburetor jet change and ignition change may be required for
best performance. Due to the varied applications of years and models of
vehicles, no one combination could suffice for all installations. The follow-
ing procedure is only a guideline and in many cases, the manufacturing
specifications for recommended carburetors or timing may be best. The
following data was found to produce best results in a test vehicle equipped
with a typical 350 c.i.d. Chevy engine.
CARBURETION
OEM Rochester 4-bbl—No modifications necessary.
Edelbrock #1405 (600 cfm, manual choke)—No modifications
necessary.
Edelbrock #1406 (600 cfm, electric choke)—No modifications
necessary.
IGNITION TIMING
Increase initial setting to 14° BTDC (Before Top Dead Center). Total of ini-
tial and centrifugal advance not to exceed 32°. Full advance achieved at
3,000-3,500 rpm. Vacuum advance curve should be 2° to 4° advance at
8-9 inches of vacuum, increasing to 12° advance at 13 inches of vacuum.
Vacuum advance line must be connected to direct manifold vacuum for
best performance, not ported vacuum.
NOTE: The best combination for any particular vehicle or application must
be determined by trial and error using the above information as a guide-
line.
SPECIAL NOTICE: Edelbrock Performer-Plus camshaft/lifters/lube kits
#2102 and #2103 have received E.O. #D-215-19 making them legal for
street use on pollution-controlled motor vehicles in all 50 states. To
assist you with emissions equipment certification, we have included a
fan shroud decal to help testing personnel verify that the camshaft is a
legal replacement part for small-block Chevrolet/GMC vehicles. The
adhesive-backed decal should be affixed to your fan shroud next to the
existing emission and engine specification decal. Do not cover your origi-
nal equipment specification decal with the Edelbrock Performer-Plus
camshaft decal.
©2008 Edelbrock Corp. Rev. 9/08 - AJ/mc
Brochure #63-2103