I bought myself a weber 45DCOE carb and lake cities manifold. I am prepping it to go on my 12A. What I've done is buy a new gaskett from mazda and pluged the coolent passages with... alot of JB weld. There is one more passage right dead center which looks like something that would fit into the old EGR for the emissions ready manifold. The manifold I have right now doesnt quite cover that port. Do I need to plug this, and if i do how would i do such a thing?

 

Any ideas guys?

 

Darn I thought one of you guys who run aftermarket manifolds would know this.

 

Yeah, really. One way to deal with this situation is to take the manifold to someone that can weld a piece of aluminum to it, then machine it down to match the outline of the gasket. If you're ever seen a Racing Beat Holley or Dellorto/Weber manifold, they're cast to cover the EGR port. I'm not sure why Lake Cities would botch something like this. There were only a couple years of intermediate plates that did not have an EGR port.

 

I'm sure one of us does, but you have to be patient! Some people only log on here once per day! Getting impatient will not solve anything. If your post falls off the main page and you must bump it, please do it politely saying something like "My post fell off the main page, I'm bumping it up so that it stays on the main page long enough for folks to see it" or something.

I'm glad that Jeff20b had an answer for you, and you can consider this a free bump... If it were me, I'd cut a thin piece of aluminum using the old gasket and new manifold to make outlines. Depending if there are bolt holes I could use or not, I'd either bolt it and use high-heat silicon, or I'd JBWeld it into place.

Jon

 

You think I could just fill it with a mig welder?

 

What engine do you have, first of all. Unless you have a '80 California engine, or a Japanese engine, you do not have an EGR system.

If you have a '79-80 engine, the air injection port below the center intake ports is a "dummy". It doesn't go to anything.

If you have a '81-85 engine, you need to cover the port below the center intake ports. An aftermarket manifold *should* cover it over, if not, it was manufactured wrong. In any case, the correct way to go about this without disassembling the engine is to weld a tab to the bottom of the manifold so that it covers the port, then have the gasket face milled flat again.

If you're willing to disassemble the engine, all you need to do is stuff some 5/16" rod into the air injection ports in the rotor housings. It helps to chew them up a bit in a vise, and them coat them with muffler repair cement before you drive them in.