Weird exhaust manifold - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**1rippen6** · 11-12-2014, 10:48 PM

Has anyone ever saw this before factory or modified

geezer#99 · 11-12-2014, 11:10 PM

Stock manifold used on mid fifties 283's had that.
The tube supplied hot exhaust to the choke coil. Directly in the centre of the choke cap. The coil housing had a vacuum connection into the venturi in the base of the carb. The manifold vacuum pulled the hot gases thru the coil warming it up.
The carb in the pic has a hot air choke converted to use the old line.

**1rippen6** · 11-12-2014, 11:13 PM

Awesome thanks for the info

1972 Jimmy · 11-13-2014, 07:29 AM

Dwayne,
My father's 1963 split window corvette has the same set up. It's an original 327ci 340hp car. The tube goes directly to the choke.
Eric

**1rippen6** · 11-13-2014, 09:03 AM

I thought it was something someone made but looked to nice to be home fabricated and now I know. Eric, send me a measurement of the washer diameter on the bolt with the captured washer I found some with 2 different size washers.

1972 Jimmy · 11-13-2014, 10:42 PM

Quote:

Originally Posted by 1rippen6

I thought it was something someone made but looked to nice to be home fabricated and now I know. Eric, send me a measurement of the washer diameter on the bolt with the captured washer I found some with 2 different size washers.

Will do! I'll take some pics tomorrow.
Thanks

11-12-2014, 10:48 PM	#1
1rippen6 Senior Member Join Date: May 2011 Location: Greencastle PA Posts: 6,807	Weird exhaust manifold Has anyone ever saw this before factory or modified Attached Images

11-12-2014, 11:10 PM	#2
geezer#99 Registered User Join Date: Aug 2009 Location: Bowser Posts: 13,736	Re: Weird exhaust manifold Stock manifold used on mid fifties 283's had that. The tube supplied hot exhaust to the choke coil. Directly in the centre of the choke cap. The coil housing had a vacuum connection into the venturi in the base of the carb. The manifold vacuum pulled the hot gases thru the coil warming it up. The carb in the pic has a hot air choke converted to use the old line.

11-12-2014, 11:13 PM	#3
1rippen6 Senior Member Join Date: May 2011 Location: Greencastle PA Posts: 6,807	Re: Weird exhaust manifold Awesome thanks for the info

11-13-2014, 07:29 AM	#4
1972 Jimmy Registered User Join Date: Nov 2012 Location: Freeland, Michigan Posts: 1,385	Re: Weird exhaust manifold Dwayne, My father's 1963 split window corvette has the same set up. It's an original 327ci 340hp car. The tube goes directly to the choke. Eric

11-13-2014, 09:03 AM	#5
1rippen6 Senior Member Join Date: May 2011 Location: Greencastle PA Posts: 6,807	Re: Weird exhaust manifold I thought it was something someone made but looked to nice to be home fabricated and now I know. Eric, send me a measurement of the washer diameter on the bolt with the captured washer I found some with 2 different size washers.



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