Want to use headers, what to do about cold weather starting?

[lead sled]

I have a 1975 500 that I want to put in a Jaguar and run headers. With the current set up there is a some hardware coming off the back of the passanger side exhaust manifold with a tube going to the front of the intake manifod and branching off to the the carb and distrubrator. My understanding is that this setup is used to run hot exhaust gas to the intake to aid in cold wearther start up.

How can I help cold weather start up if I elimanate this exhaust gas feedback?

Also what should I do about the EGR valve, I assume thats what this thing is in the back of the manifold behind the carb? I really don't think that it is working at peak performance since it is covered in rust. I live in MO as of yet I don't have to worry about meeting any kind of emission standards but at the same time I don't want to eat away the ozone either. Any suggestions????

Thanks Wayne

[~JM~]

As far as the heat riser from the manifold I wouldn't worry about it. If you really wanted to keep it you could attach a small section of tube vertically on the most conveniant header tube & use that for a heat source. As long as some ambiant air can flow into it & be heated by the header tube it will flow up the riser tube to the intake.

Most folks are trying to get cold air to the intake.

~JM~

[curtis73]

It doesn't help cold starts, it helps emissions and cold operation by getting it up to temperature faster.

At worst you might have to tighten up the choke and/or retune the idle mixture, but I've found it to be a non-issue. I also find it helpful to keep the choke brake a little tighter holding the choke closed a touch more after it starts and recalibrating the secondary lockout to stay locked out for a little longer. That will prevent bogging when its cold and you go for power.