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I've had the same problems as you have....a long long time ago.
have you tried a 1" spacer? there's some spectrum (sp?) company that sells spacers, and they have a neat removable center piece that can be open or a 4 hole spacer....i used the 4 hole spacer on mine (on a 440 with dual plane intake eddy CH4B) and the difference was night and day...i like you tried the like 1/4" eddy thick gasket and still had a heat problem. after i put on this 1" job it totally completely disappeared, and the 4-hole spacer had a second benefit, and just ran much nicer by giving the carb better signal to the barrels...so my off-idle stumble disappeared as well...
also how are your fuel lines routed? do you have a return for a vapor separator as well?

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I've had the same problems as you have....a long long time ago.
have you tried a 1" spacer? there's some spectrum (sp?) company that sells spacers, and they have a neat removable center piece that can be open or a 4 hole spacer....i used the 4 hole spacer on mine (on a 440 with dual plane intake eddy CH4B) and the difference was night and day...i like you tried the like 1/4" eddy thick gasket and still had a heat problem. after i put on this 1" job it totally completely disappeared, and the 4-hole spacer had a second benefit, and just ran much nicer by giving the carb better signal to the barrels...so my off-idle stumble disappeared as well...
also how are your fuel lines routed? do you have a return for a vapor separator as well?

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the fuel line is well away from any hot spot but it does tuck in the front below the alternator and sneaks in between the distributor and head. i have rerouted it twice in an effort to keep it away from the block and the head.

i have not tried a one inch spacer. i was considering a heat sheild/spacer set up like this:

http://www.summitracing.com/parts/MRG-3710/

but then i saw this valley pan and got to thinking:
http://www.summitracing.com/parts/FEL-1215/

i would use it without the paper gaskets.

i got rid of my off-idle stumble by using stiffer rod springs and a little richer on both stepups on the rods. it would be nice to lean it out a little as the plugs read rich.

Ben

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the fuel line is well away from any hot spot but it does tuck in the front below the alternator and sneaks in between the distributor and head. i have rerouted it twice in an effort to keep it away from the block and the head.

i have not tried a one inch spacer. i was considering a heat sheild/spacer set up like this:

http://www.summitracing.com/parts/MRG-3710/

but then i saw this valley pan and got to thinking:
http://www.summitracing.com/parts/FEL-1215/

i would use it without the paper gaskets.

i got rid of my off-idle stumble by using stiffer rod springs and a little richer on both stepups on the rods. it would be nice to lean it out a little as the plugs read rich.

Ben

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I tried tuning out the off idle stumble with the metering rods and springs, ect...my jetting was spot on, but it just had this tiny little stumble that would not go away with my taller tires on it was noticeable (28" tall and 3.23 gear) with stock magnums the stumble was gone...
anyways back on topic, your fuel line routing sounds stock...that's should be ok....do you have the exhaust heat ports blocked in the manifold? that can cause it to run a little hotter...but honestly i was almost ready to accept the problem until i saw the 1" spacer kinda like this one: http://www.summitracing.com/parts/EDL-8711/
but with the removable center...that really did it for me, absolutely no problem at all no matter how hot it is outside....
i would try the spacer first, it's really easy to install and since you have a truck it should not give you hood clearance issues like i had; i had to use a drop base to clear the hood...also my heat crossover ports are blocked....almost considered a must with after market intake i would think?

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I tried tuning out the off idle stumble with the metering rods and springs, ect...my jetting was spot on, but it just had this tiny little stumble that would not go away with my taller tires on it was noticeable (28" tall and 3.23 gear) with stock magnums the stumble was gone...
anyways back on topic, your fuel line routing sounds stock...that's should be ok....do you have the exhaust heat ports blocked in the manifold? that can cause it to run a little hotter...but honestly i was almost ready to accept the problem until i saw the 1" spacer kinda like this one: http://www.summitracing.com/parts/EDL-8711/
but with the removable center...that really did it for me, absolutely no problem at all no matter how hot it is outside....
i would try the spacer first, it's really easy to install and since you have a truck it should not give you hood clearance issues like i had; i had to use a drop base to clear the hood...also my heat crossover ports are blocked....almost considered a must with after market intake i would think?

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This is what I personally would do, block off the heat crossover and run a short four hole spacer to help throttle response. I look at it this way, an aluminum intake is supposed to help keep the fuel and air mixture cool, why heat it up with a crossover?

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aside from the valley pan with the heat riser blocked off what is the best way to block it? weld up the manifold?

i would hate to make a "permanent" change like that and chance warping the intake.

i'll probably try the spacer - i have plenty of vertical room but i do have one small interference issue with the cowl mounted hood centering pin.

it sits just above the air cleaner:



thanks for the advice!

Ben

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I know its off topic but that sure looks like a truck I just read about in mopar collectors guide just wondering how sharp my eye is.

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Your eyes are measuring 20/20

This be that truck. A photo of me with the truck in 2010 and another in 1969 made in the spring 2011 issue of Motor Trend Classic. It should be on newsstands now.

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Hello, read your thread.

What's the coolant temp when it gives you trouble? Is it getting warm?

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220 degrees is too hot, it shouldn't go from 180-220, something up. Unless you just got done climbing Peaks Pike or something.

Just a couple things to check.

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I hate that pump because it so loud BTW

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Is there a shroud around the fan? I was looking at the pic and you can't really tell. I think Chally 1 asked a great question about temp readings, I would get that under control first and see where your at.

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