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1969 427

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Jul 25, 2019 | 08:19 PM

#1

ls5bigblock

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From: NY

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1969 427

I have a 69 427 390hp The vacumn fitting on intake manifold has 3 ports one for pb the other is for headlights and wiper door I don’t know what the other port is for. Thank you for any info Tony.

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Old

Jul 26, 2019 | 06:45 AM

#2

3X2

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Auto trans vacuum modulator pipe???

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Jul 26, 2019 | 07:32 AM

#3

derekderek

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i think there are 2 vacs for headlights and wipers. small one goes thru dash to go to switches-relays. big one goes to vac tank for the higher flow needed for opening-closing actuators. kind of like a low amp wire activating the relay and a high amp wire powering the fans, lights,etc.

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Jul 26, 2019 | 08:04 AM

#4

Gordonm

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From: Forked River NJ

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That is not a factory fitting either. Probably had one in the tool box and put it in and capped the unused one off.

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