Please help me Identify what this is for 65 exhaust manifold piece

Woody3882

Member
Jun 19, 2018
44
5
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70
Bradenton Fl 34212
HI I just finished a restoration on my 65 Mustang an I have one item I can not figure out. On the 289 right exhaust manifold at the top rear of the manifold there is a small nipple about 1/8 inch I/D sticking upward. It feels as if it has vacuum . Does anyone have an idea as to what the purpose of it is. See pic..
I appreciate any information anyone can give
Woody
[email protected]
 

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GOvert

Active Member
Jan 27, 2007
258
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north central Tennessee Valley
A small metal tube plugs in to that then goes upward to the heat riser port on the mechanical choke mechanism on the carburetor. Most part store have a little kit that comes with the tube, a piece of insulation to slip over the tube and a compression ring and nut that threads on to the choke housing
 

tos

Founding Member
Apr 27, 2001
896
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Cincinnati Ohio
Yeah its to heat up your choke. If you still have your original carb you'll see it on the choke housing. You should have 2 tubes. the other I think goes to the top rear of the carb? I've make new ones with brake lines and compression fittings. It doesn't really have any noticeable affects on the way the car runs though and most people don't bother to hook it back up.