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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°.
Figure 3
Standard
Figure 6
Standard
Figures 3-4-5 are typical of Ford V8 chain alignment.
Figures 6-7-8 are typical of Chevrolet, Chrysler and AMC V8 chain alignment.
Edelbrock Corporation
2700 California Street
Torrance, CA 90503
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.
Figure 4
4° Advance
Figure 7
4° Advance
Toll-Free Tech Line:1-800-416-8628
Tech email: edelbrock@edelbrock.com
This line indicates proper timing
mark alignment (see arrows)
Figure 5
4° Retard
Figure 8
4° Retard
Timing
Marks
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