Unknown Part

Hi guys. It's my first post. I've been reading and learning a lot from this site. It's been a real help when I run into problems with my '66. I've had it three weeks (after years of searching). I have the electrical all working, the interior painted and am doing the timing chain, water pump, oil pump next weekend.

So my question. When I replaced the exhaust manifold gaskets, on the left side of the mighty Dauntless, I found a spring loaded exhaust valve, between the manifold and pipe. My guess is it smooths the power pulses by isolating each bank. I have been unable to find any references to this part, both here and on the web. I sealed it up with a new gasket and replaced it, but not knowing what it is is driving me nuts. (Of course I didn't take a picture).

What is it?

 

It's probably a heat riser. There should be a flex tube leading from that valve to the intake of the air cleaner housing. It's purpose is to heat incoming air as quickly as possible during warm up. Under heavy throttle, it opens so as not to restrict exhaust gas flow.

 

That's it, although it doesn't use a hose. I've never seen one so small and hoseless. Thanks, now I can sleep at night.

 

This is typical of "V" configuration engines, at low RPM, the valve forces some of the exhaust from one bank to go through a passage in the bottom of the intake manifold, to the other side. Keeps the fuel from puddling in the bottom of the intake, makes things warm up faster.

BTW, welcome to the forums.