1969 427 390hp

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Jul 25, 2019 | 09:22 PM

ls5bigblock

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Joined: Mar 2011

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From: NY

1969 427 390hp

I have a 69 427 390 hp The vacumn fitting on intake has three ports one for PB and one for wiper door and headlights I don’t know what other port is for any help Thank you

Jul 25, 2019 | 10:13 PM

joewill

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From: Indy Indiana

probably your dial heater control on your console that actuates your ducts
or automatic transmission?

Jul 25, 2019 | 10:37 PM

derekderek

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From: SW Florida.

I thought vacuum went thru firewall and split for heater, headlights and wiper door instead of multi hoses thru firewall.

Jul 26, 2019 | 01:22 AM

GunPowder

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Joined: May 2007

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The 3 port intake manifold vacuum fitting is correct for a 69 427 390hp with power brakes and AC. So the open port should be connected with the AC vacuum system (if you have an AC).

But the fitting on your pic looks a bit odd, I am not aware of a fitting with a threaded port for the 69 427. So the fitting might not be the right / original one ...

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