Edelbrock 1406 Heat Soak 180 thermostat? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 06-02-2018, 09:27 PM
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Edelbrock 1406 Heat Soak 180 thermostat?

Im trying to solve my heat soak problem with the Edelbrock 1406 carb. im making the following changes:
1. Block off the exhaust gas passages in the intake manifold. did that earlier today.
2. Im going to rebuild the carb tomorrow just for insurance. looks a little abused.
3. I bought a 1inch Phenolic riser to install also.

My last idea was to change the thermostat from a 195 to a 180. is this a bad idea or not. I appreciate any thoughts.

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Old 06-02-2018, 10:09 PM
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I would try the phenolic spacer first, not to say that the 180 stat is a bad idea, but you probably won't need it.
I've used wooden (insulating) spacers in the past for the same problem. Worked very well.
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Old 06-02-2018, 10:51 PM
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Keep the 195. The factories have used 'em for years for good reason.
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Old 06-03-2018, 04:46 AM
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Edelbrock makes a heat insulating gasket just for fuel percolation problems. Edelbrock part# 9266.

You can buy or order them at Oreilly's if you have one close by.
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Old 06-03-2018, 07:12 AM
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Edelbrocks have more of a fuel percolation problem because the float chambers are integral to the main body of the carb. They respond well to a base insulator. In cool Fall weather, you will find, you need a choke for cold starts and warm up. I agree with the 195 thermostat instead of a 180.
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Old 06-03-2018, 08:28 AM
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A 1" phenolic spacer 'cured' the percolation after shutdown on mine.
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Old 06-03-2018, 02:53 PM
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the first thing that comes to mind after reading your post is are you absolutely certain that's what's causing the problem? I thought the same thing and did what you are suggesting on my 1407 to no avail. if you are saying that you think you have vapor lock it may not be that at all. if you follow the link I'm posting you can see what I went through to correct the problem. yesterday I drove about 25 miles some of which was in stop and go traffic and my temperature gauge was about as high as it's ever been in a hundred and one degree weather. I made three stops with percolation times anywhere from 10 to 15 minutes. I have one of those fancy radiator caps with a very accurate thermometer inside it that showed 240 degrees when I got home. and she cranks right up every time no matter what the temperature is. check out this link to see what eventually fixed everything.

https://49fordcoupe.smugmug.com/Fighting-Vapor-Lock/
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Old 06-05-2018, 09:33 PM
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Thanks for all of the great replies!

So far it seems like the problem is GONE! The temps haven't been to hot here in Cleveland, OH this week, but its already much better. The rebuilt carb is working flawlessly now. I'm getting much better throttle response too! I did opt to keep the 195 thermostat in too. ill keep an eye on everything and if the problem comes back, ill post again!
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Old 06-06-2018, 06:36 AM
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Good for you Clayton. Always good to hear.
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