I removed the intake manifold from my 77 Cordoba with 400 cid (6.6L) and found some really nasty looking insulation between it and the valley pan gasket. It appears to be fiber glass or something like encased in aluminum foil. My guess is that it was used to reduce engine noise and heat coming up into the intake area. Where can I find this stuff to replace the packs that were under there. The old ones are torn and oily.

I also found that the area for the EGR valve is covered with what appears to be an OEM plate and gasket. It was packed with carbon that I chipped out. I have a shop manual for this car and while it gets into EGR maintenance etc, I have the feeling that the Lean Burn engines didn't use an actual valve with all the other items the manual shows. None of that stuff is present. I have removed the LB system from the engine and replaced the distributor with a Pertronix unit. It works pretty good, but I was using an old Holley substitute until the Thermoquad carb comes back from the rebuild shop. Am I correct in assuming this car didn't come with an EGR valve?

 

The 383 in my Fury has the same stuff. I bought a 4bbl intake manifold and it also had the foil....

I install hydronic radiant heat systems in homes and commercial buildings, use 'foil faced' insulation to direct the heat and I would imagine that a piece or a couple of pieces of 'foil faced' insulation would do the trick.
I don't know if there would be an 'automotive' grade or if it would be any different.

I found a link for you:
http://www.alibaba.com/showroom/foil...nsulation.html

 

Thanks appreciate the link. I'll get me some.

 

I found the same thing in my 76 Cordoba 400. What did you end up doing?

Thanks

 

the O.E.M. insulation is to keep the metal pan from cracking. i actually found a cat that was making it new. cant remember where. when chrysler uses the word insulation it can mean a few different things.

 

Can you expand on this a little, Moe? I'm really curious of the history here. And why don't all B B/RB engines employ this? Thanks.

 

very wrong

 

So Why is it there ???????????????????????????????????

 

im guessing to absord some heat so it doesnt affect performance of the intake mabey fight heat soaking idk it sounds alittle dumb but im sure theres a reason if its factory

 

Ok...Ok......
1. To keep the Valve Lifter noise down... Valley pan was tin
2. To keep the intake Manifold from cracking... A rush of cool air under the manifold after shutting the car off could crack the manifold from the under side. Don't forget there is a heat crossover for the carb choke thermostat.
3. They did not put it in the Hi-Performance Cars....

Hope that helps

 

i got that info from two sources. 1. an old mopar parts man with a direct connection to chrysler enginering. 2. an artical writen by a former chrysler engineer. i have seen tons and tons of b wedge , all had the insulatior. of course there could be some that didnt, ie max wedge. long tube ram.

 

Ok, so it was only used on Bs, not on B/RBs?

 

sorry i should have said B / RB.... most of the time i put both in the same bunch.

 

My all original '67 New Yorker had two of these nasty pads under the intake manifold.

Here's a place where you can buy new ones:

http://www.performancecargraphics.co...Insulation.htm

 

Ok here is the skinny on the insulation yes it does keep the valley pan from flexing and from possibly cracking. It also insulates the valley pan from forming condensation in the cold weather and causing a cheese buildup inside the lifter galley.. I also keeps the heat away from the intake runners causing a vapor locking/hesitation problems... It was an engineering marvel thought up by the top brass a Chrysler and those guys are paid very well for there brainy ideas.... ...Bill

 

Oh it also catches all the oil that leaks like a diaper and I have seen them catch fire before... Like I said it was an engineering marvel...Bill