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What the heck is this? A quiz [message #281523]

Sun, 05 July 2015 19:33

kerry pinkerton

Messages: 2565
Registered: July 2012
Location: Harvest, Al

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Senior Member

I determined I had a vacuum leak either in my carb or in the intake manifold of my 403. A cracked intake was a possibility so I pulled the carb and with a strong light saw this:

http://www.gmcmhphotos.com/photos/misc/p58339-hole-in-intake.html

http://www.gmcmhphotos.com/photos/data/6256/20150705_170749.jpg

One hole centered under both primary bores.

http://www.gmcmhphotos.com/photos/misc/p58340-hole-in-intake.html

http://www.gmcmhphotos.com/photos/data/6256/20150705_170830.jpg

Close up of the holes. The left hole will accept a 1/2" bolt which is why it looks cleaner than the other which appears smaller...perhaps 7/16"

http://www.gmcmhphotos.com/photos/misc/p58342-hole-in-intake.html

http://www.gmcmhphotos.com/photos/data/6256/20150705_172758.jpg

http://www.gmcmhphotos.com/photos/misc/p58341-hole-in-intake.html

http://www.gmcmhphotos.com/photos/data/6256/20150705_172736.jpg

I saw this and basically went insane. What the hell are two holes doing in the bottom of the intake runners. You can see the bottom of the passage below the holes.

I stumped 3 people before I got the answer. Feel free to offer your idea in this thread. I'm going to explain in another thread. If you want to play along don't read the other thread first. Shocked

Kerry Pinkerton - North Alabama Had 5 over the years. Currently have a '06 Fleetwood Discovery 39L

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[Message index]

		What the heck is this? A quiz By: kerry pinkerton on Sun, 05 July 2015 19:33
		Re: [GMCnet] What the heck is this? A quiz By: Kosier on Sun, 05 July 2015 20:03
		Re: [GMCnet] What the heck is this? A quiz By: GMC.LES on Mon, 06 July 2015 08:37
		Re: [GMCnet] What the heck is this? A quiz By: powerjon on Mon, 06 July 2015 11:24

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