Timing - Team Camaro Tech
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post #1 of 3 (permalink) Old Dec 2nd, 19, 08:29 AM Thread Starter
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I have the day off and I’m finally going to go out and try to fine tune the engine. My 396 has a vacuum advance Billet 850051 distributor & Holley 750 DP with four corner idle screws. I did Dave Ray’s mod to the vacuum can. I have a roller hyd. Comp Cams with .550 lift. I have printed out some pretty good instructions as far as the sequence for the different air/fuel circuits and I have O2 sensors so I can monitor the AFR. I also am going to install a vacuum gauge.
But I have two questions - I have a dash mounted vacuum gauge-where should I connect the line for the vacuum? In a carburetor port or manifold port?
Next question - with the vacuum advance plugged, what number am I looking for as far as timing?
Thanks in advance!
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post #2 of 3 (permalink) Old Dec 2nd, 19, 09:29 AM
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Re: Timing

Vacuum gauge goes to intake (full) vacuum , as in manifold - any volume below the throttle plates.
The volume can be accessed from a port/nipple on the carb base plate or teed from the larger port on manifold itself.

The timing would be initial setting providing the RPM is NOT high enough engaging the centrifugal weights.
Timing should be the same when checking timing with the starter motor.

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post #3 of 3 (permalink) Old Dec 2nd, 19, 10:23 AM
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Re: Timing

do a search for this in this forum: BBC 396 L78 Modified - Timing recommendations
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