That is probably a heat riser valve that is supposed to provide manifold
heat when the engine is cold. If that is what this is it is open when the
engine is warm.
modifier@bigfoot.com wrote:
> I have a set of headers that I am going to install on my 91 Dakota 318.
> Before I install them I am going to send them to Jet-Hot to get them
> coated. My question is: There is a small piece that goes between the
> left header and the crossover pipe with a spring loaded valve in it.
> Should I have this coated also ? And what would happen if I took the
> valve plate and rod out ? I think it's in there to create some
> back pressure for the EGR valve, but I'm installing the headers to
> reduce
> pressure and increase flow. Would the EGR valve still work without
> the extra pressure?
> It's too bad I have to do all these mods just to get about the same
> horse power as a stock magnum engine.
> Thanks for any information.
> mike
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