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Old 04-28-2020, 10:18 PM
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63 bomb 63 bomb is offline
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Default Sprint Vacuum Advance Port

Which vacuum port on the Quadrajet is for the vacuum advance? Is it the one that’s in the throttle plate facing the front of the engine, or the one that’s above the rear air mixture screw? Thanks as always!

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Old 04-29-2020, 06:37 AM
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Jeff Hamlin Jeff Hamlin is offline
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Quote:
Originally Posted by 63 bomb View Post
Which vacuum port on the Quadrajet is for the vacuum advance? Is it the one that’s in the throttle plate facing the front of the engine, or the one that’s above the rear air mixture screw? Thanks as always!
66-67 Use the port on the carb body above the mixture screw.


FWIW;
The factory layout runs a tube from Dist up and over the front of Cam House then alongside to Carb and around to the port.

Rubber connections are from Vac adv to tube and from tube to Carb Port.

Cheers.

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Last edited by Jeff Hamlin; 02-26-2024 at 07:15 AM.
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Old 04-29-2020, 08:31 AM
Hokie1984 Hokie1984 is offline
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Interesting, my vacuum line goes to the back of the block and follows the fuel line. Looks stock.

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Old 04-29-2020, 10:03 AM
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63 bomb 63 bomb is offline
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Thank you guys.

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Old 04-29-2020, 11:43 AM
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george kujanski george kujanski is offline
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I don't remember a metal line around the front of the cam cover either...I had a '67.

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Old 04-29-2020, 07:38 PM
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You guys are correct,
'67 did change the line/tube to run parallel with the fuel line on later applications.
The 1BC Vac line was at the rear of the carb while the 4BC was still above the mix screws.

Sorry, I can't keep my files straight.

Cheers.

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Last edited by Jeff Hamlin; 02-26-2024 at 07:15 AM.
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Old 04-29-2020, 07:40 PM
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Default 67 4BC

...

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Last edited by Jeff Hamlin; 02-26-2024 at 07:15 AM.
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Old 04-30-2020, 06:47 AM
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Thats what I remember seeing on 67-69's, That is a rare one pictured, a 67 with California emissions!

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