intake gasket is sweating coolant?

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Just a thought the Felpro gasket may be designed for Iron heads to and Iron Intake, factory applications.

Edelbrock Gaskets more than likely designed to seal the Aluminum surfaces, aftermarket applications.

your right i hadnt thought of that. But i wouldnt think it would matter
 
For the hell of it I left the radiator cap loose and will observe it over the next day, the radiator is full as i have a overflow tank but im wondering if just a fluctuation in the ambient temp is causing the coolant to expand and push out of the gaskets, i dont think that will make a difference since i would think there is more pressure on the system while its running but im just curious.

Can pull your oil plug real quick and put it right back in, catch in an oil drain pan. If there is any anit-freeze in the oil at all it will be at the very bottom of the oil pan and come out first. You may even see anti-freeze coming out around the drain plug threads as you are taking the plug outs.
 
I see you are using those custom intake manifold bolts. They come in the long version 2"" and the shorter version 1 1/2".

I would drain down 2 gallons of coolant out of the system, then remove the 4 outter corner intake bolts and put in shorter ones. You custom bolts may be too long and are bottoming out in the bottom of the threads? Hence not pulling down the intake tight enough so it is leaking on all 4 corners.

It has got to be something like this if it is leaking on all 4 corners. Pull out one of those corner bolts and see if the end of the threads are starting to burr over from bottoming out.

4 shorter bolts beats pulling the intake all over again.
 
I see you are using those custom intake manifold bolts. They come in the long version 2"" and the shorter version 1 1/2".

I would drain down 2 gallons of coolant out of the system, then remove the 4 outter corner intake bolts and put in shorter ones. You custom bolts may be too long and are bottoming out in the bottom of the threads? Hence not pulling down the intake tight enough so it is leaking on all 4 corners.

It has got to be something like this if it is leaking on all 4 corners. Pull out one of those corner bolts and see if the end of the threads are starting to burr over from bottoming out.

4 shorter bolts beats pulling the intake all over again.

yeah but they were in there before and it wasnt doing that, just doesnt make sense. I even put the bolts back in the same spots they were in They are definitely the 1-1/2” bolts i believe. I just dont see why it has taken 2 months to start wicking coolant
 
Any chance the gasket sealant around the water jackets messed up or altered the gasket? It is supposed to be non hardening but im wondering if it is letting the gasket migrate or move slightly causing the coolant to wick out. I guess im gonna order a set of the edelbrock gaskets and try again. This time use rtv around the water jackets?
 
Any chance the issue is the gasket? I used the felpro 1213s which has the stainless steel core but i was reading somewhere where someone believed the steel core gaskets wont compress enough with the lower torque values of the aluminum intakes. Does this sound possible?
 
Any chance the issue is the gasket? I used the felpro 1213s which has the stainless steel core but i was reading somewhere where someone believed the steel core gaskets wont compress enough with the lower torque values of the aluminum intakes. Does this sound possible?

I used those same gaskets for 2 different intakes and 3 engines now. All with an aluminum intake, and the last 2 sets with aluminum heads. No issues.

You can rent/borrow a coolant pressure tester from many auto parts stores. You might have better luck tracking the issue down by using one, see if you can pinpoint where it's seeping from?
 
I used those same gaskets for 2 different intakes and 3 engines now. All with an aluminum intake, and the last 2 sets with aluminum heads. No issues.

You can rent/borrow a coolant pressure tester from many auto parts stores. You might have better luck tracking the issue down by using one, see if you can pinpoint where it's seeping from?

its seeping up from the gasket on all four sides, but the coolant isnt seeping out the ends, only seeping up the gasket towards the valve covers, then it looks like its sweating out of the gasket. Idk if its a bad gasket or the gasket sealant affected the gasket, im going to try and get a edelbrock gasket set and use rtv around the water jackets instead of the gasket sealant
 
its seeping up from the gasket on all four sides, but the coolant isnt seeping out the ends, only seeping up the gasket towards the valve covers, then it looks like its sweating out of the gasket.

Right, but if it's seeping then a pressure tester shouldn't cause it to stream out. Only wick a little faster. If it streams, that tells you there's an actual direct route for the coolant to leak.

Sounds like the taper of the heads and manifold may not match?
 
Right, but if it's seeping then a pressure tester shouldn't cause it to stream out. Only wick a little faster. If it streams, that tells you there's an actual direct route for the coolant to leak.

Sounds like the taper of the heads and manifold may not match?
Was the old intake installed by OP? Or did it come with a previously built Mill?
 
Was the old intake installed by OP? Or did it come with a previously built Mill?

the engine has been rebuilt with the edelbrock heads and intake installed by the engine builder, had no leaks for about the first 2 years then every once in awhile the driver front intake bolt would barely seep coolant, took it out and put some permatex #2 on the threads, at the time i didnt know that the bolt hole is blind and not into the water jacket, it would seep from time to time but never more than one little droplet. Well around the end of February this year it started leaking worse. So i decided to change the gasket. Two months later and it was good until i noticed the weeping/wicking this week
 
One of a advanced auto parts stores about 30 min away has a edelbrock 7276 gasket set in stock, gonna go there after work and get it, i wanna be done with this lol
 
Ran after work and got the edelbrock gaskets. Got the intake off and almost the whole gasket is damp. I looked and the impression from the intake appears to be uniform and you can see the whole intake flange made a uniform indentation in the gasket

what caused this? I dont believe the valve covers are leaking, the edge of them was dry and no oil on the intake

275DD46A-71BC-423A-8C23-7388A6D384C1.jpeg
 
yeah but the bolts arent leaking, the coolant is soaking the gasket and literally looks like it is traveling through the gasket and then sweating it out.

Whoa! Here is your problem, better listen to what @toolmanmike is saying about the 4 outter bolts going into the water jacket and leaking.

You can see pretty obvious the bolts go into the water jacket, all the other bolts go into the oil valley.

Drain your coolant down below the manifold and re seal the 4 corner bolt threads with this "Aviation Sealer" best stuff for sealing bolt threads.

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Beats pulling the intake off again. clean the gasket area with the 4 bolts out with Brake Parts Cleaner before applying the thread sealer.
 
Whoa! Here is your problem, better listen to what @toolmanmike is saying about the 4 outter bolts going into the water jacket and leaking.

You can see pretty obvious the bolts go into the water jacket, all the other bolts go into the oil valley.

Drain your coolant down below the manifold and re seal the 4 corner bolt threads with this "Aviation Sealer" best stuff for sealing bolt threads.

View attachment 1715930915

View attachment 1715930916

Beats pulling the intake off again. clean the gasket area with the 4 bolts out with Brake Parts Cleaner before applying the thread sealer.

the 4 outer threaded holes on the edelbrock heads are blind, they are not exposed to coolant
 
I actually use the Aviation sealer on all the intake bolt threads to seal them from water and the oil.

See you have your intake off now. Take Brake Parts Cleaner to all surfaces and blow dry. then reassemble and seal all the bolt threads with Aviation sealer.
 
the 4 outer threaded holes on the edelbrock heads are blind, they are not exposed to coolant
Correction;
the 4 outer threaded holes on the edelbrock heads are supposed to be blind,
If you didn't pressure test before you pulled the intake, and it leaks again............
By the pressure pattern, I don't see anything wrong at that juncture.
BTW; IMO those FelPros are foolproof, I have reused my set several times.
 
Once again, if those 4 outter bolt holes are blind you for sure want to make sure your bolts are not bottoming out in their holes.

If they bottom out they will not pull the intake down tight.
 
I dealt with some similar problems after going to a six pack manifold and pro Comp heads. gaps the fitting surfaces are close but not perfect . In my opinion the top end will need to be taken down and mating services checked,mocked up , adjustments made top quality gaskets and sealants used reassembled. Good luck.
 
Correction;
the 4 outer threaded holes on the edelbrock heads are supposed to be blind,
If you didn't pressure test before you pulled the intake, and it leaks again............
By the pressure pattern, I don't see anything wrong at that juncture.
BTW; IMO those FelPros are foolproof, I have reused my set several times.

im pretty confident that the threaded holes are not getting coolant in them, the ends of the bolts on all 4 corners had no coolant on them, i also did use thread sealant on all the bolts. But i get what you are saying
 
Hearing all the comments here I sure am a lover of studs.
Once again, if those 4 outter bolt holes are blind you for sure want to make sure your bolts are not bottoming out in their holes.

If they bottom out they will not pull the intake down tight.
Makes me think studs would be a good idea.
 
Once again, if those 4 outter bolt holes are blind you for sure want to make sure your bolts are not bottoming out in their holes.

If they bottom out they will not pull the intake down tight.

i checked that and the threads in the 4 corners are 1-1/4” deep, intake flange is 3/4” thick for a total of 2”

The intake bolts i have are 1-5/8” long from washer to end of threads
 
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